A nut case motivated by a religious ideology of conquest by violence, namely Islam.
A motivation, by the way, it would seem in the violent acts of many nut cases, singly and in groups, around the world.
Yep, but no organization. If he was a member of a group, then we have a problem. If he was a member of a group but acted on his own, they have a problem, because he just blew their cover.
I think he was a individual nut case.
I personally think there are groups in this country right now that want to and will harm us. I don't think he was part of one.