Never. The only reasons I don't post things are because either I don't want to get involved in the topic (often happens with political debates or, oddly specifically, ones about alleged police brutality) or when I spend way too long typing and re-typing my post and then decide "no, I have better things to do". Or when posting something would get me quoted and yelled at a lot for having an unpopular opinion because, let's face it, even here on the Escapist people get berated for having an unpopular opinion even if it's totally reasonable/justifiable for them to have it. Namely, almost anything conservative get yelled down.