How many more copycats are waiting in the wings for their...

How many more copycats are waiting in the wings for their moment of fame — from a national media machine that rewards them with the wall-to-wall attention and sense of identity that they crave — while provoking others to try to make their mark? A dozen more killers? A hundred? More? How can we possibly even guess how many, given our nation's refusal to create an active national database of the mentally ill?