> If, on the other hand, the Third World teens are more
> mature and able to carry firearms (they definitely do
> carry other weapons), maybe that's because they haven't
> been infantilized by overprotective governments?
Third world parents can afford to send their children to school for a long time, where they are effectively segrated from adults. Third world children have to deal with people of all ages, all day long. And that has a stabalizing influence on them.