The problem with the blame game — arguing overwhose side a criminal terrorist “belongs to” — is that it completely avoids the issue of actual importance: What are people going to do to prevent a recurrence?
In this case, there’s plenty Spencer et. al. could do in cleaning up their rhetoric, but I do get a bit annoyed with everyone, the moderate right especially, but the left included, for favoring ideological ownership snits over constructive responses. This happens every time… Joe Stack, Jared Loughner, etc.