A game is simply a virtual world that represents something. For those that play violent games and copy what is done in the game then I think that:
a. that person should not be playing the game in the first place.
b. that person has some sort of mental disorder.
Violent games are purely for entertainment and are not designed to create any real life threats. Like I said, if people start doing things in a game then they are just taking it too seriously.
So no, gaming does NOT kill but rather people KILL people.
In general, everything you do kills... Somethings just kill you slower than other :D