I can understand this idea. I tend to agree that confronting the harshness of reality (death, suffering) is an important act, particularly in your formative years, so that those confrontations don't paralyze you as an adult. Traditionally this is also done, differently, but getting your kid a pet and ceremoniously allowing them to process the grief of that pet's inevitable death (however it may come).

But... I don't know. Are any of us better people for watching a US soldier get executed on our computer screens when we were 14? Does that content, in fact, give people a sense of hopelessness and dread? When a confrontation with death or violence becomes a common (everyday?) occurrence, what does THAT do to the psyche of a child? Certainly if you watch enough, the hyperreality of exuberant violence serves to disassociate the viewer from conscious engagement and does become a morbid form of entertainment and I personally believe (despite the "free speech" angle) it is dangerous to condition your mind to be entertained by suffering.