"These kind of people" might come across as wrong to a few, which is completely fair and justified. But as you said - "getting them back to Earth" is a wrong idea. That implies that current situation is completely fine and these people are eccentrics, which is most definitely not correct. Rather than silencing a few who speak their minds and getting things back to (ab)normal; we need to find our own ideas on how things can be fixed, if not by the ideology proposed by such people.

We need to collectively work towards a solution than silencing a few.