It's advocacy. People want to remove the influence the owner has on public discourse. Advocacy, like strike action does things which have short term pain because of a belief in a goal.

Also, we implicitly make these choices all the time, by not listening to Fox, or Pravda, or Al Jazeera or a host of channels, by chosing not to pay, not to bypass the pay wall.

I do not disagree that it seems extreme. It's dichotomous behaviour to me. But, it's human, and normal. I don't personally think everyone who remains on X is evil or against my world view. I just find I'm happier off it and ignoring it.

(I'm sure you know this. I'm not trying to school you, we're just making observations from different sides of the fence but the fence is there and we're in agreement about that if nothing else)