Why don't they just add a (-1, Bitchslap) moderation category instead of hiding behind "Overrated"?

These 3 comments (2 of mine, and 1 of Jugulator's) were modded down to -1 in the span of less than a minute (from scores of 3 and 2).

http://slashdot.org/comments.pl?sid=66604&cid=6123556

See subject.