GTA series is one of the best gaming series (if not the best ever). Games are safe for everyone because they are just that games. I can say that the crime rates are roughly the same now as they were before the ESRB rating was introduced and that is only because games don't influence people do do crime. If anything they teach them not to do crime because you are usually playing as the good guy.
I can say ( having played all the GTA games from the first part and I was 10 when the first part was introduced , before ESRB) that the story behind every one of those games is awesome. There zillions of movies that have a stupid story and killing in it and the graphic of violence in them is the only awesome thing.
People start doing crime because they're poor and uneducated so they have no other way to make money.
In the last series of GTA your cousin gets killed and it is so sad that you
could almost cry and you die so many times in the game to learn that the crime doesn't pay :D
If anything GTA teaches you that the world is not good or bad and that your actions impact what will happen. Remember in almost all games you kill people for the sake of killing them and there is no story behind it (Gears of War ,Call of Duty , Quake and so on).
The bottom line is GTA is like a good crime movie in which you choose how things will work out and after that there is no turning back. All of my friend have played GTA and have not killed anyone , robbed any stores or anything like that.
It is my opinion that you should let your kid play GTA if he is over 14 and able to recognize good from bad and you can always leverage the game to your advantage ( first homework than playing and so on).
I believe that GTA teaches you more than bad movies like Spiderman or Transformers and should be played by... ow.ly/oOOgw .