Why should video games be unrated

Well actually, they shouldn't be, because if parents are aware about their children looking at blood and gore, which my parents honestly don't care about because i'm 14 almost 15,
and they wouldn't want their kids to go off killing people which is illogical. But online interactions are NOT rated by the esrb so. Ok on to the killing if they were playing a game such as Assassins Creed(R) they would come into the havi of it maybe so they should not be rated. But to answer your question "why should video games be unrated" uhhhh. well i wouldn't mind it but theirs no telling what could be on there that their parents want to see.