It is especially interesting that this all apparently occurred online. So he didn't have Islamic "friends" actually patting him on the shoulder and offering him "pick-up tricks" while they downed "cold ones" at the local bar. No one to actually "pal around" with.
So what caused him to switch loyalties? If we knew that, we could develop an algorithm to detect such traitors earlier.
Or - he's just a nut-job.
Regards,
My son has told me over the years that islamic missionaries are all over the gaming sites talking to teens and young men about islam. Like the conversion efforts in prison this is beginning to bear fruit.