I see video games as an expression of art. I feel like unnecessary attention is brought to this form of entertainment than is warranted.
I believe if someone is capable of committing a horrendous crime, the potential was already there. If an individual can't make a distinction between
playing and the real world, there are major mental issues there. Emotions can be expressed through games that you wouldn't otherwise be acceptable
to express in a real life situation. I think that teaches people to deal with their emotions in a controlled environment. I personally feel games
have taught me to deal with my anger and frustration.
This is a nice essay on the subject which is written by Henry Jenkins,

currently Peter de Florez Professor of Humanities and Co-Director of the MIT Comparative Media Studies program with William Uricchio...
...Jenkins earned his MA in Communication Studies from the University of Iowa and his PhD in Communication Arts from the University of
Wisconsin-Madison
Henry Jenkins Wikipedia Page
If anyone would have an unbiased, intellectual, and completely factual opinion about the subject, it would be him.. At least in my opinion.