As long as you have a concept of offtopic, I think you have to be able to kill stuff that is, or even with downvoting you'll get topic drift. Reddit showed tha

As long as you have a concept of offtopic, I think you have to be able to kill stuff that is, or even with downvoting you'll get topic drift. Reddit showed that. (Reddit wasn't trying to avoid topic drift. They were trying to evolve into whatever interested the most people. But the goal here is different.)