big deal, it is easy but still harder. The examples you cite prove my point the homicide rate in Spain is 0.8 per 100,000, Norway is even less as 0.6. THe US is 4.8 (this is the homicide rate which includes all weaapns).
These cultures have the same TV programs and movies that the US does. Yet their homicide rates are multiple times lower. you are correct that they are not 0, and that People that intend to kill will do just that.
Yet it is important to determine why our homicide rate is so much higher than the very countries you mention, and what can we do about it.