Even here on HN insulting other posters gets you banned. Same in many US media. There's quite a discrepancy between what people claim and the reality on the field, why you think? Yes I'm aware I'm shifting focus from Europe to the US, but you know, who should cast the first stone...
Private companies should have the freedom to ban/censor whatever content on their platforms they want. I’d prefer if they don’t, but we shouldn’t force governments to prevent companies from creating their own rules about how people can use their own software
Governments however should not interfere with citizen’s freedom of speech - there should be no fines/arrests for insulting politicians. Otherwise those governments are actually authoritarian and repressive.