My son has some violent games – he’s in his mid teens now. We didn’t really approve of him having them but he’s a gentle person, not into real-life violence or agression at all.
But I do think that violent games can influence some more impressionable people. Also I wonder about some of these driving car chase games might be a bit dodgy if you have to go out and drive a real car after a long session o, for example, Gran Torismo!!