[brandonjm]

> If there's a way to do this on reddit once some dubious character has claimed a given topic, I'd like to known.

There is nothing preventing multiple subreddits dedicated to similar or identical things. If you feel abusive people are taking control, chances are others do too. So the best course of action would be to start another subreddit dedicated to the same thing. You and others who feel this way can build a better, less abusive, less controlled environment and people who prefer that environment will move over in time.

Edit: Also if you install the right moderators for the environment you want to create it can ensure the abusive individuals can't take control of your subreddit.