That's not true at all . If there are actual consequences for actions then you massively reduce the amount of toxicity in your online space. Eg, if your account gets banned completely so that you are locked out of online play. While there are workarounds sometimes you generally at least lose progress.

So like.... why do we need to tolerate that when we can just ban them. They are actively making the gaming experience worse and making the community worse.

What's the point in purposefully allowing toxicity in video games just because some loser gamers can't control their emotions?

Why do the rest of us who just want to have a good time and play the video game have to deal with losers having a tantrum over voice chat?

You don't give them power if you ban them after all.