What do you mean by "worship violence"? Because we can start with several martial arts closely tied to (if not based in) religion, & end in a video game phenomenon in which the goal is to enslave innocent creatures & force them to fight... somewhere in the middle there is tentacle rape.
eastern martial arts are first and foremost based in discipline, and tempered with spirituality.
Culturally, violence is our preferred way of problem solving, and is almost synonymous with our concept of masculinity. That, i think is the crux of the problem. When you combine this misinterpretation of masculinity with narcissism disguised as individuality and a general lack of respect for the people you live around (both personal and institutional,) and then add guns... well... there you go. That's not to say that it doesn't exist in other places, it certainly does... but Americans love the idea that they're tough, don't give a f*ck and will fight over anything. The fact that this has never been less true than it is now only makes it more insidious. We bought into our own myth, and it's f*cking us up.