The only "another side to the story" that I might be able to buy is that he was a mentally unbalanced man that did not get into any serious trouble until he fell in with the Muslim crowd that conditioned and trained him to be a psychotic killer for Allah.
I am not suggesting that there are any facts to support this narrative, just that it is entirely possible.
The "Religion of Peace" is turning a lot of mentally unbalanced but otherwise harmless dupes into suicide bombers and terrorists for Allah.
He made the choice to join a cult... the killer doesn’t get a pass for that anymore than he would get a pass for joining a street gang.
Lie down with dogs - wake up with fleas...