I don't really see the problem here? This looks like http://content.screencast.com/users/TomWij/folders/Jing/media/84baac6d-6f27-45b0-9e3e-05c259c96ad0/2011-06-07_1306.png to me.

You are destroying an user with the intent that his questions, answers and comments are deleted.

This action should not affect other users or their reputation; think of an edge case where the bad user also asked a very good question which received a magnificent answer, or think of an edge case where you would want to revive a specific question that will be deleted in the progress which means you would have to revert the actions on the answers too ...

In your case, they have spent time on looking for a removal tool so keeping their reputation is worth it.

Changing this behavior would be unnecessary work, as reverting will be more complex (or impossible)...

I don't really see the problem here? This looks like to me.

You are destroying an user with the intent that his questions, answers and comments are deleted.

This action should not affect other users or their reputation; think of an edge case where the bad user also asked a very good question which received a magnificent answer, or think of an edge case where you would want to revive a specific question that will be deleted in the progress which means you would have to revert the actions on the answers too ...

In your case, they have spent time on looking for a removal tool so keeping their reputation is worth it.

Changing this behavior would be unnecessary work, as reverting will be more complex (or impossible)...