To your first point, the nature of communicating right now, particularly on the internet, means there is no room to have two different voices:
You can’t have an “inside voice” (communicating to those who already agree with you and reinforcing micro-cultural support) and an “outside voice” (communicating with everyone else, potentially finding or convincing new supporters); every statement is heard by everyone and is, de facto, outside voice.
And that’s only for people who would otherwise care to differentiate— the overall culture views conflict as a virtue, and so rewards people who “tell it like it is,” ignoring the fact that you can tell it like it is in ways that don’t maximize belligerence and alienation.