The problem isn't that Blue Check marks are polarizing. The problem is that there are lots of communities on twitter - gamers, scientists, tech, conservative, bernie. The problem is that accounts with a large number of followers will necessarily have followers who come from lots of different communities. It's when these communities come into contact with each other that fights happen. That's the mechanism for the creation of drama on twitter, it's two groups that come from fundamentally different bubbles intersecting.