Actors (and novelists, etc.) are not lying to or deceiving their audiences - not in any sense relevant or analogous to what we are discussing here.
Persuading someone to believe something which is false is a skill (the same skill required to persuade someone to believe something which is
true).
In either case, the motives of the person doing the persuading have no bearing on his effectiveness at persuasion.
No more than my motives in using a hammer affect my ability to use it.
The idea that lying cannot possibly be used for good is absurd on its face, and your argument to that effect is pure assertion.
This touches upon another critical aspect of the question of whether (or to what extent) significant and lasting change can be achieved via electoral politics,
The fundamental problem is democracy, and there is no good or lasting solution to the problem as long as democracy exists.
The scales are permanently tilted against liberty under that dreadful system.
Any movement toward liberty through electoral politics will require a herculean effort and a great deal of luck.
And if once we do succeed, the same effort and luck will be required to preserve our gains.
But there is no realistic alternative at the present time.
One of the many "democratic illusions" under which people labor in modern America is that elected politicians (at least on the federal level) actually control anything in any real or substantive way. I see no particular reason for thinking that this is the case.
The politicians do whatever gets them re-elected.
What gets them re-elected is pursuing policies that big donors and voters want them to pursue.
The people want what the media tells them to want, because they don't know enough to have their own opinions.
And the same big donors control the media.
This is the only sense in which politicians "don't really control things."
Thus and sadly, winning elections (by "bamboozlement" or other means) has little chance of consigning the "powers behind the scenes" into that libertarian goodnight (gently or otherwise).
No, a President, or other politician, can absolutely pursue policies antithetical to those vested interests
provided either (a) he is willing to lose the next election, or (b) he can propagandize the people better than those vested interests and thus ensure he wins the next election despite their opposition. Obviously, Option B is what we should be aiming for. The odds are massively against us, because we do not control the major opinion-molding institutions - but it isn't impossible. If it were impossible, Rand and others would never have been elected to the offices they currently hold. But, to the main point I've been making, success in this endeavor requires that we not handicap ourselves by sticking stupidly to the truth in those cases where a lie would get us further (e.g. endorsing a part of the system to which we object but which is highly popular amongst the voters we are trying to attract).
It honestly seems to me that you are much more concerned than I with the precepts to which "demophilia" is prone - if only in a negative sense. You persist in framing matters in terms of "the people" as some sort of monolithic entity, to be dealt with and addressed only as a single homogeneous unit. But nothing in what I have said depends upon any particular quality or attribute of "the people" in general, or as a whole - or even upon that subset of "the people" who are sufficiently "demophiliac" to go to the trouble of voting in elections.
If you think there is an advantage in telling the truth in electoral politics, and a disadvantage in lying, this entails that you think the people can distinguish between truth and falsity on political questions, which means you are attributing to them more knowledge that they have, or can reasonably be expected to ever have.
All that is necessary is that "enough" people begin to passively cease or actively refuse to go along with the (federal) system's wishes.
Yes, your alternative to electoral politics: civil disobedience.
I can tell you exactly how many "enough" is.
Ready?
50% + 1 of voters.
Politicians will not change course unless they feel threatened at the voting booth. Why would they?
A democratic state will simply force the minority to comply.
Civil disobedience is not an alternative to electoral politics.
(That said, it can be a useful
supplement to electoral politics, if it changes voting behavior.)
(As for how much "enough" might be, that is, as I have also said previously, contingent upon time, place and many particulars of circumstance.) For just two particularly notable historical examples of the general principle involved with what I am talking about, one may refer to the (violent) American Revolution - in which the "patriots" (from among "patriots," "loyalists," and "neutrals") were not (initially) in the majority (and may not even have enjoyed a plurality) - and the (non-violent) collapse of the Soviet Union, for which no one voted and which did not require any "understanding" of economic principles or political philosophy on the part of "the people" in order to be accomplished (it merely required that "enough" people stopped "going along" with the ruling Communist Party apparatus - and that is exactly what happened).
This is something else entirely.
In the first case, you're talking about a violent revolution. That, indeed, does not require a majority. But it does require an extremely highly motivated minority, well armed, and organized. I see no reason to believe that it would be easier to violently overthrow the US government than to persuade a majority of voters to change it peacefully - rather to the contrary.
In the second case, you're talking about the collapse of a state through mismanagement. For that, we need not do anything at all. Just wait and see what happens. Maybe the US government will collapse at some point. Of course, there's no guarantee (or any reason to believe) that the result will be an improvement. It will most definitely be another state, not anarcho-capitalism, and who knows whether better or worse. In the Russian case, the state got better, but - given the starting point - that's not saying much.

How is it "cynicism" to express the belief that a society can't and won't be free unless enough of its members want it to be free ... ?
Because it's unrealistic to expect most of the people to want freedom.