Your introduction paragraph before the essay states that you essay is 'about how violent video games do not increase aggression in adolescents'. However, you seem to prove two points. Firstly, that they do in fact increase aggression and that video games have positive aspects. These two points are, of course, true to some extent but if you are trying to show the opposite then your essay does a poor job. I don't want to outright criticise you and you are right in saying that video games may not be the main culprit but it's just that the essay doesn't really do what you say it will which technically means it is a bad essay.