Haruhion

Games must take a part of responsibility for glorifying it, selling on the shelf and advertising in the first place. But hey, it's business. So, still a very, very small part of responsibility.

It's based almost solely on the parents no matter how much it is dressed up. I, personally grew up in a particularly open atmosphere with 18+ rated games, movies etc becoming a casual thing. Though my parents always analyzed how I reacted among those things and often spoke deeply to me about it. Depending on how they thought it was effecting me they altered my access to certain things and talked further.

As KingAngry says, you need to be a meaningful part also, rather than only providing for them. By no means am I, or they, in any sort of position to write a book, but if you as a parent do not even care how your child will react to certain material and completely close access to it all, then you have bridges to build and ignorance to deploy. If you don't let them near the fire, they won't know it's hot!