It influences those sensitive to becoming violent. If you're predisposed to something, it doesn't mean you'll become what you're predisposed to being, but with the right influences, you're more likely to become that way. I've read and watched horror all my life. I'm not a violent person, in regards to my own actions. People have to take responsibility for their own actions, no matter what.

Advertisers know that certain images, sounds, colors, etc. affect how we view a product. But while you might see a delicious-looking burger for a fast-food chain and crave it, you make the decision on whether or not you eat it. You're responsible for your diet.