StackOverflow's poor gameification of the platform is the singular reason it suffered from its awful culture.

If you had enough reputation, you'd be invited to these review queues, like the Close Vote queue.

You got a point toward a new badge if you voted to Close. You get nothing if you chose to keep it open. There was always a perverse incentive there to act, to make a question "better," to nitpick a perfectly fine answer.