More than ever, we are "bubble-fying" our youth from the realities of life. In ancient times, children of Sparta were sent for military training at the age of 7. They didn't raise/create a nation of psychopaths. In many, many cultures, young girls were betrothed as children to others and married off as early as 12 or 13. There aren't tales of mass suicides or mass "running away" of young married girls or Spartan boys from back then. There are many other examples of exposing young people to the rigours of adult life early on and the children weren't horribly, irreparably scarred from them.
The fact that we used to live those ways as a species doesn't mean those ideals were the best. However, fear of children finding out the world can be a harsh place isn't doing them or society any favours. The hard part, as MrPaul is pointing out, is defining the age and the depth of content suitable for that age where we show the raw realities of life without sugarcoating or hiding them.
I feel, MrPaul, you are a little too nanny-ish/nanny-stateish but I laud your purpose and point. There are things I should not have experienced at the age I did in the ways I did that marked me for life. I might've been better had it not happened as it did. However, I must advocate for children in the opposite sense for you, in that we shouldn't baby-proof the world if a child is mature enough to handle how it works, and we shouldn't tell a mature child she/he's not mature enough just because of how many years she/he is at her/his maximum growth so far.
I know I would've resented someone telling me at 17 that I wasn't mature enough to know how very bloody the real world could be. In a case like that, you'd have to deny me the right to see any television news shows or channels and only allow me to read the comics section of any paper, let alone not allow me to learn any history in school until I'm 18, as history is chock full of violence, some of it quite horrific and senseless.
I actually prefer the maturity rating system for games and allow parental involvement in the process; a Mature-rated game must have parental approval for purchase but once the parent agrees, the child may purchase the game. Do I believe all parents are thoughtful and take into account the child's actual maturity level instead of falling for some ridiculous scare tactic by "Think of the children!" loonies? No. However, I don't believe it is society's right or job to decide for a parent, what their child may experience, so we'll just have to hope the parents pick sensibly for their child.
TL;DR Please don't tell my (theoretical) child what they can or cannot experience, even in the world of gaming. When I finally have the little bugger(s), it should be up to me what I allow them access to, but I'd appreciate being warned about games that may be of a maturity level I don't yet feel my child(ren) is(are) ready for.