If you search or view dang's comments you can see multiple explanations on why and how posts are flagged.
Many people will flag if they think a submission will cause flame. And many people will flag if they see most comments are not constructive and are just complaining about comments. It doesn't make interesting reading. For what it's worth I came here via new comments and the submission was already flagged, so this is for whoever is left!
Check out the usual guidelines:
"Please don't comment about the voting on comments. It never does any good, and it makes boring reading." and remember that people like interesting things. Keep this a good interesting place.
Additionally there seems to be an increasing paranoid-like, conspiratorial, us vs them group mentality and accusation of brigading and censorship. This type of thinking are thought terminations and can morally hurt oneself. They don't encourage people to think of others as other people like themselves but encourages people to see more enemies around them and leads to dead end conclusions and prejudice.