This has nothing to do with justification. When our military goes over and kills not hundreds, not thousands, but millions of people who've done nothing to us, what do you expect them to do?
For the most part, Muslims aren't robbing and killing folks in Black neighborhoods, nor White neighborhoods, but suddenly one incident is used to tarnish the entire group. That's illogical at best.
Be careful of taking one incident and rationalizing it into blaming an entire group.
If it was left up to me, I'd pull all of our troops out of the Middle East and let them solve their own problems.