Agreed with the guy above.
My favorite book when I was 4 or 5 (and yes I could read then due to being read to every night and private schooling) was "Jack the Giant Killer".
I know you're thinking of the mickey mouse version now, it wasn't like that at all... It showed 2 giants with nooses around their necks pulling against each other because it was the same rope thrown over high point. A pit with spikes at the bottom with a giant falling down about to hit it.
My favorite though? He goes to breakfast after spending the night at a giants castle, he survives an attempt by the giant to kill him by replacing logs under his covers the night before, and he has a pouch under his shirt. Jack tells the giant he's unkillable, and after drinking all his cereal (actually pouring it into the pouch under his shirt) he takes a knife and slashes his shirt and pouch open.
The picture is of him with a knife slashing his own body open, the cereal pouring out of his now cut shirt and pouch. The page opposite that picture is the giant trying to out-do Jack with knife in hand and raised high about to plunge it into his own gut.
When I was 9 years old through 11 years old my favorite genre was horror movies. I laughed and laughed. They were my comedy. This is why I no longer like most horror movies... they're for kids. (over 8)
I've had access to quite a few guns because of my brother who was a U.S. Marine and gun lover (deceased now and all guns gone away sadly) and I was not by any description a popular person in high-school. I never shot up a school, or w/e. When I see pictures like the ones from the torture by my government (USA) showing a 2 foot wide and 5 foot long bloody streak on the ground (shown on the TV news) I feel literally sick to stomache. Clearly I wasn't "desensitized to violence" or any other of the nonsense the controlers want people to believe.
The bad parenting isn't letting kids watch / play violent movies /games... it's not explaining things.
IMO if you haven't instilled a good, for lack of a better word, "moral" foundation by 8 years old... you've lost the chance to and your kids won't learn them.
From 8-12 you need to give them more and more freedom of what they watch/play and give GUIDANCE (The "G" in PG and PG13) on what they are seeing.
13+ They can and should make their own decisions on media they intake. They are still too young to make adult legal decisions, but by that age they have earned the right to free speech or you have raised them as slaves or psychopathic nazi's / killers. Both are equally bad but I'd take psycho's over sheep any day, at least they know what they want and have their own ideas and agendas.
More and more governments take away rights and treat adults like 5 year olds. We need to treat adults like adults and treat kids like what they are: ignorant people who need older people to teach them instead of keeping them ignorant and compliant. You don't solve ignorance with ignorance, you solve with knowledge.
Hope I wasn't too terribly preachy.