In the game of prisoners dilemma, I want to be around people who practice the winning strategy.

A game to demonstrate why that is important: https://ncase.me/trust/

If you cooperate when others defect, you promote defection as a strategy.

If you defect when others cooperate, you undermine cooperation as a winning strategy.

So a community that shut down defectors and cooperates by default creates a community based around cooperation -- a high trust community.

Bad faith is another word for defection. It is hard to understand the game you are playing or see the consequences of your actions without education.