Do games make people violent

So I'll begin with a joke I just heard in case this post gets serious later...

A Dota and Lol player were arguing which game was better. The Dota player said "Dota is better". The Lol player couldn't deny.

I think I can understand why some people would think that violence in video games make you violent. If you are not the one playing the game and you see that there is 'violence' in the game then you are likely to see it as some kind of violence simulator. I used to watch people play games and ask, "why would you play that? it's so violent, can't be good for you" and they reply that it's "fun". I didn't understand at the time because I never used to play games but after recently starting to play some games(thanks to interests sparked in lectures and tutorials) I'm beginning to enjoy these games. It is only after playing that you realise how little it is about the violence and much more about the aspects in Calleja's model of immersion. When I look back and analysed what I enjoyed about playing these games, I think of in particular the idea of playing in a team, each person has a different role for the overall success of the team. I also think of the performative aspect where there is pressure to do well to not let down the team and improving your own efficiency. Where does the violence come in then? it's just part of the process.

Therefore when you think of 'Media-effects research' it just makes no sense.

From lectures and tutorials, it seems that the violence/video games research is not multi-faceted enough. First of all, the world of concern will be affected when the experimentees are playing in a researched context, makes it harder to be immersed in the game. Secondly, it seems that they do not take into context at all the family circumstance; any history of violence in the family, any instances of being bullied/bullying at school. These are things that will make a huge difference to the behaviour of a person. Sometimes it really is just terrible parenting. These are things that the research needs to take into account in order to be accurate at all. I liked the example that was mentioned in class about a bunch of parents made to play games which they actually enjoyed and managed to be quite immersed into them. I think in the research process, the  researchers also need to take into account how the various aspects of the game (calleja's model) in relation to the violence contribute to game and this may require the researchers actually playing the game themselves.
It is impossible to incorporate all this into the research but ignoring these factors will render the entire research null.