Im intelligent. Lets examine a clown who kills for these reasons. If you were trying to save the audience from a demonic screening you would do something to the theatre and not the patrons.
If you are a lonely sad loser you pay attention to what other people are paying attention to and develop a seeething hatred/criticism for the passions of others. On the surface it may come across as veiled disgust for the stanning of a film. Underneath that is a loser noticing people directing their attention at something that is meaningless yet has more meaning then his existence. Rage of being a lonely loser develops into demonic jealously and culminates into events like this. Couple that with a history of being bullied, isolated, anti social and you have a classic case for a depressed attention whoring killer who wants his name to be mentioned with the same infamy as The Batman Trilogy. Its so demonic.
If this man was smashing dimes, this never would have happened. If women gave 1 fukk about him, and topped him off with skully and that P regularly, this never would have happened.