Because that's the only way to fix the problem.

Bad stories like the ones mentioned by the OP are really popular with a demographic that we don't want here. There are lots of people who love nothing more than to argue about things that make them angry, and if they see something that makes them angry, they'll immediately vote it up so that they can argue about it.

But we don't want this to be a community of angry people arguing with one another. To avoid that, we need mechanisms to actively discourage it.

Simply standing by and hoping that more nerds will upvote Haskell tutorials won't help if the room is rapidly filling up with veteran YouTube commenters.