http://stackoverflow.com/questions/7297107/removing-characters-between-brackets/7297239#7297239 (The link is for 10k users.)
I've looked at the FAQ but don't see a reason for deletion that applies.
Would it be possible for the moderators to comment on answers they are about to delete first, and give an explanation, before going crazy with the delete button?
For what it's worth, I don't mind people pointing out when I make a mistake, so that I can learn from it. However, I found having my answer deleted with no explanation at all a very off-putting, negative experience.