Why I voted No:

They've increased awareness. More people know that crashers can be stopped by using things like WPE and PeerGuardian.

True, they haven't actually stopped any crashers, but there's little chance of that happening unless you're either willing to a) play whack-a-crasher with IP address or b) ban a class C or B, and take the collatoral damage of blocking everyone on the same ISP.