sounds like you havent played many violent games in your life. theres plenty where there is violence for the sake of violence (Im not talking about goody-two-shoes games where all you kill is terrorists and utterly bad guys). postal 2 is a decent game too.
again, I dont NEED to. just explain the hypocrisy as to random people can be killed and kids cannot.
a public outcry is a good explanation, but I want to take it deeper and see why the act is so taboo in entertainment industry (movies, music, games) where killing adults is often glorified, idolized and made pretty much routine.
Don't make assumptions, breh. games and violence go hand in hand. But name me a narrative game where killing anything wasn't a major part of the point. (besides puzzle or sports) Games JUST got to the point of morally grey this/last gen with things like Braid and Shadow of the Colossus. Part of justifying violence in games was the fact that majority of your enemies WERE obviously evil. It sounds like YOU haven't played many games outside of GTA and Postal. Open world has to be cartoony to a point because it would be boring without it.
and If you think Postal 2 is a decent game your opinion on the matter is void. Both Postals are AWFUL games.
to go even deeper, you a clearly disregarding the cultural and biological norms of humanity. We don't kill kids often because everything in our genetics and cultural institutions says we PROTECT children. In fact, when a kid dies in film/games its a plot device used to enrage or depress the protagonist, a child's death is seen as a GROSS failure in art/media/culture ect.
A week in anthropology class will tell you that, you are asking a question that has a very obvious answer, you got these responses because this is something that you should not only know scholastically but also inherently.