The example of such a question. It has -6 (minus six) as for the moment.
It was not deleted cause of bounty as moderator explains in his answer
The problem is if some very bad question is already answered and bounty is awarded it cannot be deleted - cause someone already invested time to answer it and received the bounty.
If we go the way we have at the moment it means we have double standards. The question I have linked is a good example for https://stackoverflow.com/about
Don't ask about... Questions you haven't tried to find an answer for (show your work!)
Maybe we can use some extra queue for bounty questions?