By "they" I assume you mean GrapheneOS supporters? I can only speak for myself, but I only flag things when they clearly deserve to be flagged. Fair discussions are important. They help us grow as people and even in our case, GrapheneOS, but we encounter a crazy amount of misinformation here. Some members of our team are also targets for endless harassment. It's so unfortunate that people behave that way. There are also clear sockpuppets attacking GrapheneOS while promoting others. There was a brand new account participating in this thread that was clearly doing that.

Misinformation, harassment, and people who are using unfair methods to win arguments and damage the reputation of others is unacceptable. That's the kind of thing that I flag. What other people do with their permissions is up to them, but I would say that I wouldn't condone people flagging just because they disagree. I'd consider flagging genuine questions to be awful behavior as well.

I ask a lot of questions in the GrapheneOS community, I oppose a lot of opinions that are held there, but I have never been "flagged" for questioning or for debating something. The only time somebody is going to be flagged is if they are being outright disrespectful spreading misinformation or just being a general asshole.