Well, there are thousands of things better for a 2-6 yo to do than playing/watching this game, there is a Teen rating for a reason.
No child under the age of 10 should play or watch this game due to it's violent content and directives, which are justified by the story, and I don't want to hear comparisons to other games, that is not the point.
There is absolutely no need for a child to experience this type of game when there are hundreds of games FOR them to CREATE and EXPERIENCE new ideas/environments...
Oh ya, there's also an entire PLANET for kids to learn about just outside the door, it would be good for them to be taught by people who have an interest in their future and well-being, and mental health above all.
I can tell this is a pointless discussion anyways as parents these days are usually less mature than their own children, geez...