I honestly want to say that in the grand scheme of things, no. Here's the thing, human history is chock full of violence. People have experienced real violence through human history, I seriously doubt that simulated non-real violence is making people worse off. Granted there might be an argument to be made that experiencing violence, whether real or not, might cause some tendencies but it is impossible to isolate any effect that a single thing has on us because we live in a dynamic world with so many influences.