All this interventionist/non-interventionist stuff is a pure manifestation of the state's existence. Without it, those for war would have to fund it entirely and convince troops to join THAT WAR voluntarily (not just join the armed forces under the false pretenses of defense, only to be ordered on the threat of lost benefits or jail to fight in wars of initiated aggression), and could not rely on the half against the war to be forced into subsidizing the war, and could not rely on threats to staff the positions needed to carry out the war.
If all funding and troops for the war were derived strictly via voluntary means, then the morality of the war is largely quantified and knowable. It doesn't boil down to trying to get minarchists to think logically (which may happen over a period of years of self-reflection, but not in a debate, because minarchy is based on an illogical premise, and them expecting a long term logical result is magic fairy land stuff).
Want a justified war? Then drum up donations. If you whine about being extorted (taxed) already, then push for them to be tax-deductible donations (and of course, that means to NOT incentivize war via moral hazard, ALL donations to private institutions for anything the state currently does would also need to be simultaneously made tax-deductible).
Want a justified war? Start PERSUADING people to give up their lives for your cause.
Here are the two horrible arguments against this ethical means to derive funding and manpower:
1. The people are cheap and wouldn't pay unless threatened with rape cages and property seizure (the pro-taxation argument).
2. The troops are cowards and won't join a particular war; they only join the military voluntarily and then we have to order their cowardly asses into individual actions.
Both are shit arguments because...
1. We give more total dollars of our own free wills to charities (let alone for-profit businesses) than any other people on Earth. If they refuse to give that doesn't make them cowards...it means your shitty case for war wasn't good enough to morally justify funding it to them.
2. No war that was truly justified and not partly started by us for non-defensive reasons has EVER wanted for volunteers. See recruitment for the militias via Thomas Paine's Common Sense (and well before it) in the Revolution, and the 9-12-01 recruitment spike. We never lost a war in our period without a standing army (although that's a separate debate, I thought I'd mention it), AND we only needed drafts for wars that were not sold to the people well enough (or could not be sold well enough because they were IMMORAL AS FUCK).
Until all funding and staffing of troops is done purely voluntarily, it's anyone's guess as to what wars are ethical...and it's likely few if any. If you can't convince people they need to do something for their own defense, then it's just your opinion with a government gun backing it (to extract funding and staffing of troops for your opinion).
And enough of this conflating terrorism with war bullshit...
Terrorism is as likely to kill you as an American citizen as your bathtub (actually the bathtub kills you more often on average). How fucking afraid are you to die in your bathtub? The proportion of fear related to other risks is how we determine rational vs irrational fear. If you are more afraid of terrorism by a large number than dying in your bathtub, you are being IRRATIONAL. Stop using your irrational cowardice to justify wars. You, as an average American, should be far more afraid of being shot by a cop than killed by a terrorist....and yet I have to read people on this forum blow Rand while cradling his balls and saying "but ISIS is an imminent threat".
Not if we stop provoking them. And if they end up being such a threat later, then deal with it accordingly. But the idea you can EVER justify a war without funding it and staffing it PURELY voluntarily is nonsense. There is no way to quantify it when coercion is the source of troops and funding. There is no way to argue how threatened you feel by ISIS while simultaneously having little or no fear of things that are much greater threats to you or that are nearly equal threats. You guys need to get your fear to rational levels (fear proportionate to relative risks). You should be far more afraid of cops, house fires, cars, medical mistakes, etc. than terrorists. ESPECIALLY terrorists who didn't start killing Americans until we started bombing them. ESPECIALLY when the Americans they killed KNEW they were in a war zone. The first one killed was a prisoner in Libya BEFORE this! He fucking knew the risks...so just stop the nonsense.
This is why all republics (and to faster extent, democracies) FAIL. You can't get logical results long term from an illogical premise. Majority opinion is NOT the same as consumer preference (people answer polls one way, and then reverse it when they are asked to PAY for that which they just "supported" rhetorically). Majority opinion is an informal logical fallacy. The idea we can vote our way out of the eventual collapse of Rome 2.0 is crazy talk. The voting mechanisms make it so the BEST you can ever hope for is a Rand-type...we'll never get what is moral or just like that. Our movement will be co-opted one election at a time until Ted Cruz and Rand Paul are themselves incrementally cornered and seen as "too extreme" on libertarian points. Trying to appeal to the majority will always lead to incremental neutering of any liberty movement. It turned classical liberals into anti-free market, pro-huge state modern liberals over a period of less than 2 centuries. It turned Barry Goldwater conservatism into neoconservatism in less than 50 years (just as Goldwater said would happen). It WILL turn libertarianism into little more than paleoconservativism (pro-protectionism, anti-free market, anti-immigration, pro-labor market protectionism, pro-tariff/indirect taxation, anti-elimination of tax, etc.).
Winning elections IS NOT how generational changes occur. It's at best a symptom of an already occurred change. To change this country, and the world, we need to first change minds. If we focused on using elections to change minds instead of actually winning (like Ron did), then we'd be fine. The problem is, we focus on winning to the detriment of the message and changing minds (Rand). That leads to people who feel lied to when they believed our politicians, and it leads to NOT changing their minds. They come to reject our FAKE message as lies, and never accept our REAL message because we squander the opportunity to let them hear it.
We need to be lighting "brushfires in the minds of men", not winning elections for short term gain that isn't going to be sustainable, and as sophists who fit in with all the other sophists (just with slightly modified positions).
Fuck majority opinion. The first thing I do when the majority agrees with me is review all my premises and logic to make sure I'm not wrong...because the majority agreeing with you is usually the first sign you are fucking totally wrong. You want change? It won't come through the implicit violence of the ballot box. It will come before that, via changing minds. The wins in elections should ONLY be happy accidents showing the people are ready for RADICAL change...not watered-down, won't make a major difference, change. If you don't convince them of the need for radical change, and instead run elections to win them no matter how much you have to bend to the whims of the violent, fickle, and stupid mob, then OF COURSE you will incrementally destroy your own cause. They need truth to convince them, and that means we need to run on truth, not run on really trying to win as our first goal. Sure, we won't win elections for a while, but when we finally do, America will be begging for radical change. The Rand approach is just a logical long term disaster (and that assumes he's being a sophist and just hiding true libertarian opinions...which I have come to doubt).
Brushfires in the minds of men can only stay lit when truth is their fuel. They burn out quickly and consume the fire-starter when the combustible is little more than pandering and compromise of principles (as opposed to coalitions ON individual principles). Don't be surprised if you get burnt by your nationalism, statism, and sophistry.