Kill them all. With fire. Spare not a single one.
On a slightly more serious note; the problem is now twofold. There's the userbox mess to clean up, and the mess it's made in the community - ripping the oldies and newbies apart - to clean up too. I'm thinking a bit of friendly re-education into what Wikipedia culture is might not be amiss. Instead of stating, "you don't get it"; teach people what "it" is.
Rob Church