Well, technically, he may have done it. But, he was rejected by two women. He'd been interviewed by police a year or so earlier for suicidal tendencies, and let loose. His roomates noticed that he was acting peculiar, but they didn't do anything about it.
Somehow, inspite of his past interviews by police, he got his hands on two semi-automatic pistols, piles of ammo, and several ammo clips.
So, technically, maybe he did it. But, the real people responsible were the two women, the police, his roomates, and the gun salesman. Since all of those Virginia Tech people died..... The REAL responsible people should be executed for their part in the crime. After all, when you get right down to it... He was NOT to blame. They were.