Game complexity induces anger rather than game content. Or put another way, there is little to no peer reviewed evidence that computer games induce any form of long term aggressive behaviour.
Even though anecdotally people believe the reverse to be true, a bit of careful thinking makes it obvious that it cant be true. If it were true, then there would be a LOT more violent behaviour than there is. It would also be true that happy games would make everyone lovely, which is also obviously not true!
Games that induce longer term annoyance tend to be games which are complicated to play or non intuitive to achieve success. This means the dopamine hit is harder to findband instead annoyance grows. GTA is quite a straight forward game which allows playability for any number of aims.
It may well be the case that if someone is prone to anger then a lower arousal environmeny is better, in which case (and if this applies to your son) I can understand your concern.
Have you considered games such as SIMS, the lego games or others of that ilk?
If he plays on a tv screen or uses a large monitor you may also wish to adjust the light settings. Bring down the backlight very slightly, and reduce the amount of blue light specifically if you can. This will help with sleep patterns, reduce arousal and perhaps help him maintain moods more easilly.
If the above does have a positive effect, it may be worth exploring tinted lenses (if he would be open to wearing them).