Key words being "emotionally detached". You're essentially putting the cart before the horse. People don't commit crimes because of movies/TV shows/songs/etc. It doesn't "activate" a person with good mental health to do something wrong, which is what a lot of people would like to believe is the case. These people already have issues, and chances are they were going to act on their murderous impulses with or without seeing/hearing a particular piece of art. Again, the idea that we should hold art up as being in any way responsible for what these people do is absurd.
Something else: did anyone think, before hyping this film up as being possible inspiration for these incel fucks, that doing so might actually inspire someone to do something stupid? Putting that kind of discussion out there is more dangerous than the film if you ask me. These fuckers want people to remember them when they commit their acts, and round the clock discussion about such things is one way to make sure people never forget what they do.