I agree 100% that what happened to AVSIM was a totally destructive event, and I feel personally angry about what happened, but I think we might step back and look at a bigger picture here.
Malicious attacks, like viruses are a part of cyber life, and like human viruses we develop a system of resisting them so that we are not overcome. If this never happened, we would be wiped out by the first virus to come our way, so in a bigger picture, viruses are healthy as long as we have a system to cope with them. As Dave has pointed out many times, we have to BACKUP so WHEN this happens, we can reconstruct and move on. When the attacker realizes that we are more resilient and less perturbed by his attack, he will move elsewhere.