...but not just anybody.
My keen intuition and flawless deductive skills have informed me that this is not a very good tag. There're 15 questions on SO with the help tag right now, of which only three seem to be legitimate uses.
What ought a humble vigilante janitor do in cases like this? Retag the invalid ones manually? Retag the valid ones to something else and wait for the offending tag to meet an incandescent demise, that we might dance around its funeral pyre?
Edit: Looks like someone helpful has started cleaning up manually. Still wondering about the situation involving bad tags being blacklisted though...