reddit has the ability to hide post vote counts for a certain time to mitigate this. It's a feature that's worth bringing across.
(I also think it's worth capping the number of upvotes and downvotes a post/comment can get - and to do so asymmetrically, eg no more than 10 downvotes and 100 upvotes.)
Doctor Manhattan's ability to save the human race wasn't the issue. He was basically a god. It was his willingness. He didn't feel the need to stop humanity doing anything: