I'd add (not saying you said otherwise) that marketing bad ideas well isn't quite the same as good communication. I guess a funny thing is that the more naive or blind or optimistic one is, the more one might wiggle their way out of some definitions of “liar.” If they're good at lying to themselves, maybe it doesn’t count as lying to others.

Is "better marketing" a euphemism for "more willing to misrepresent the other side, turn a practical issue into an emotional one, and generally trot out every logical fallacy they can think of"?

Because that's what I see constantly on social media in response to progressive ideas the rest of the world has largely accepted but apparently just can't possibly work in the United States...