Too tightly wound is my guess.
'Course the homeys were all jihadists and couldn't have THAT kind of thinking around, thus ... ex ... band member.
Now, why did the ex shoot?
Maybe ... just maybe ... he knew something was going down and he stopped it (we DO have hero's that helped the US) ... but because he felt no one would believe him ... he iced himself.
It's as good a story as whatever.