How do we know Islam has anything to do with them? They could just be violent individuals that happen to be muslim. We don't know, but using preconceived notions to assume they are isn't the right way to go about it.
an attacker getting offended because some girls are wearing shorts and a vest has some cultural/religious baggage
if you've got evidence to suggest there was mental illness or a history of violence then that changes things but at the moment that is completely unknown



