Moreover, instinct is an instinct, you couldn't easily get rid of it unless you modify your gene. Men are more aggressive than women due to the testosterone level amount in their body. Therefore, in my point of view, certain amount of violence is acceptable in the video game, because it is a way for some people to relief their aggressive nature, more or less. You would feel happy when slaughtering some minions in the game right? There is not much to discuss.
Anyway, everything have two sides, good and bad, you can't completely wiped out one side, as they are coexisting. That's why our society still allow violent game to be release, but on the other hand, the government will restricted the content to be release to specific ages to balance both good and bad side effect a person mental health.
P.s. I am a non-aggressive male. :)