Here's a cautionary tale from the US:
Parents take away 17-year-old's copy of Halo 3. 17-year-old shoots both parents. 17-year-old tried and convicted.
Judge says: ""I firmly believe that Daniel Petric had no idea at the time he hatched this plot that if he killed his parents they would be dead forever."
Parents! Waste no time in explaining the concept of death. Buy short-lived pets. Hang out in graveyards and old-people's homes. The life you save may be your own.