> To say nothing of facial expressions. If followed down properly, this rabbit hole of a logic leads pretty deep.
I'm not sure why you're having such a difficult time drawing the line between billboards and facial expressions.
How about this: "People should be able to express opinions and propaganda however they'd like. Inanimate objects in public spaces should be constrained by something similar to the Fairness Doctrine[0], where factual information is allowed but blatant propaganda is not".