If I knew that I were allowed "one abuse per month" I would choose my target carefully, and make that abuse as effective as possible. ;-)
I don't think it's fair that this "one abuse per month" dispensation should be given only to admins. Non-admins should be permitted one personal attack per month, one page vandalism, one frivolous listing on VfD or RfA or RfAr or RfC, one trolling attack on the mailing list, one sterile revert war, and one edit of a talk page to misattribute everyone else's comments.
VV