While Jack Thompson was genuinely an idiot (and if I'm not mistaken, a registered Democrat who voted for Biden), I think a problem for a lot of more level-headed conservatives and religionists was just that, they weren't good at articulating those points.
A lot of them made the mistake of arguing on their opponents' terms. A lot of them were woefully outnumbered (partially thanks to manufactured consent) and had to stand their ground in a room full of liberals/leftists/secularists/atheists, and thus get destroyed through sheer volume and being laughed out of the room, not because they actually had bad points.
@WelperHelper99 also brought up the point about people arguing against lolicon in a room full of degenerates who are OK with that crap, and getting destroyed that way.