Bratton didn’t know of any “MOTIVE” at the time.
Well, dumbo. Let’s try one called “to kill a cop”.
Everything else is secondary.
Or it could be any innocent Westerner.
“So when you meet those who disbelieve [in battle], strike [their] necks until, when you have inflicted slaughter upon them, then secure their bonds, and either [confer] favor afterwards or ransom [them] until the war lays down its burdens.”