I think you are out of line, friend. I specifically came to this site to avoid censoring and bans. If someone is dooming, take the time to show them what you think is wrong about their point of view. Use evidence, debate them properly, bring them into the light. If we just start banning people who have different views (unless they're obviously shills or saying violent things), we're no better than the platforms we left to come here.

And look. I'm not a doomer myself, but there is plenty to be discouraged about and it shouldn't be a thoughtcrime to talk about it.