No matter how unsavory the parties are to a given dispute, does that change the essential facts of a case?
Not if they're both extremely unsavory.
As I've said before, if the Arabs were to give up their claims to Jerusalem, and just ask "to be left alone", to be an independent nation in peace, that would change the equation
entirely. But that's not what they've done and that's not what they want.
Do we believe in property rights? Is property theft acceptable? How about compensation?
To the extent that land has been stolen, then they do deserve compensation. But you don't exactly get to launch rockets from a piece of land, and then claim the land is stolen when you get evicted from that land.
And then for propaganda purposes, it gets combined with collective guilt. Some person or group on one side kills some people on the other side. It is then considered collective guilt of all of the people on a given side. It goes both ways. Is every Israeli citizen guilty of the actions of the Netanyahu government? Is every resident of Gaza guilty of the crimes of Hamas murderers? Are people still individuals?
Neither side of this conflict treats the other as individuals. They should and they don't. They're both garbage people.
Both sides kill innocent people.
Are there good Israelis? Probably.
Are there good Arabs in palestine? Probably.
Are they still mostly garbage people on the whole? Yep, they are.
Let's look at a simple analogy. If that is true, are all of the people who have supported the actions of Luigi Mangione (who assassinated the CEO of United Healthcare) also guilty of murder? How about his fan clubs? What law can be applied, and successfully prosecuted, to make anybody who has supported him, or his actions, guilty of a crime?
They're guilty of murder if they voted for and provided support to Luigi knowing he would do that and in support of that, yea.
And if the CEO's family or anybody else felt compelled to kill them to stop them from murdering anyone else, I wouldn't really have much opposition to that.
But in reality noone voted for Luigi and provided support to Luigi to do it, so that's where your analogy breaks down.
Some people in government would like to make any speech or protests that favor Gaza illegal. On the other hand, should speech in support of killing people by a government be criminal?
Speech by itself shouldn't be illegal. But that's not what this is about. The people in Gaza actively vote for, fund and support the activities of Hamas, in addition to their speech indicating approval of their activities.