Unless I'm missing something here, the assailants were hospitalized. That's not "shot dead". Second, I haven't seen the details, but the cops are only supposed to use force when it's necessary to protect others. It's possible that the two guys represented a threat to other people (weren't they ranting in the streets with a bloody machete?) whereas the other guy wasn't. The first guy claims to not remember the crime, so it's entirely reasonable that he was taken without major incident. As for the second case, it's also possible that the police thought taking them down was the only choice. Even if they shouldn't have shot the guys, questionable police shootings happen all the time, sadly. I very much doubt this has anything to do with religion. Finally, you may think they're both "batshit crazy", but there is a clear distinction between those with mental illnesses and those without them. Simply being a radical doesn't make you insane, but having voices in your head drive you to murder probably does. Double standards certainly exist -- especially in this context -- but you won't find any with your example.