Do violent video games create real violence?

http://electronics.howstuffworks.com/video-game-violence.htm?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+DailyStuff+%28DailyStuff+from+HowStuffWorks%29&utm_content=Google+Reader#mkcpgn=rss1

This article discusses how violent video games may cause violent behaviors. I personally think if a person has any violent tendencies then, of course, it would cause more violent behaviors. Some people who are already violent do not need to be involved or play violent games. It just gives them more reasons to have violent tendencies. What do you think?