They've got the drive and resolve, and a substantial lot of them lack the brains which would get in the way. There are no doubt plenty who would happily kill a mosque full of traitors, and then line up nice and orderly to be executed by the government(s) of the nation they were "defending", seeing themselves as martyrs all the while. An interesting parrallel to the Muzlim suicide bombers.
No. Don't kid yourself, these groups are friends of the bin Laden crowd. "The enemy of my enemy", and so forth. Some of them have already declared.
The government better do a little anti-terror checking on those folks too.