@berserk yeah, even me can't delete messages so it's only the message author or a diamond user. Since I doubt any SE employee bothered to come here and delete your self kill message, more likely it was a misclick - we don't get confirmation when clicking the delete link. :D
Anyway, nothing to do here as room owner actually except change room description and see deleted messages.... what do you need it for? :)
(I use the power also to remove stars from old WAG stats messages so they won't litter the star board, but so far never kicked anyone except my sock to test it)
@Mooseman thing is, the Den welcome everyone without discrimination: men, women, ponies, bots, and all the rest. Even a flying whale would be welcome here. So "bot spam" is just undefined. :D