About bans for toxicity

So I just had a general question on how people felt about punishment for being toxic. As everyone knows, people are toxic in pretty much any online game, but most games don't punish it.

In a game full of death, weapons and blatant sexuality among skins (almost naked champions?), you'd think telling someone to 'fuck off' should be totally fine, and I do.

Yes, there are obviously restrictions to this. Making threats or telling someone to kill themselves or you're homophobic, transphobic etc, that's unacceptable. I simply don't understand why swearing at someone or getting mad will warrant punishment. It's a frustrating game.

That's just my two cents. I don't feel that "toxicity" should really be a means for suspension, except in the above stated cases of course, but I know other people have opinions. Please if you disagree with me give me an actual reason.

Even with all these bans for "toxicity" the League of Legends community remains arguably the most toxic, why?