On the Role-playing Game site we have a problem in that users will not vote to close a question, even if they they say it doesn't belong.
For example this question:
Has three downvotes, several comments saying it doesn't belong (from users over 500 rep), and only one vote to close.
It even has it's own meta question where the consensus seems to be "this doesn't belong here".
And this is only one example of the trend on the site.
How can we teach users to close things they don't want on the site?