I don't think you used enough action words so i would like to add a few just for good measure. :D <br />
A vile, vapid, vascular, verbicide toddler with signs of reverberating neglected verberate. That has internet access and computer savvy is apparently too much for EP to guard against. O.o
How would you single out one user without singling out a group?
No. Because the spammer is mimicking the behavior of an actual user. Making new accounts, you get enough coins to feature one question I think and then when everyone blocks he increments a number and starts again. To a human it is easy enough to see however, it is not so for a computer program.
Its probably a 70 year old with the brains of mush that defeated the vaunted invisibility of the EP defenses.