Learning the tools of modern warfare...

[Raptor]

"Learning the tools of modern warfare is the difference between the prospering of your people and utter destruction."

Seriously, even though I love the Na'vi culture, they need to learn some modern warfare from Jake to prepare for an RDA invasion, because next time, they might not get lucky. As long as these weapons of steel and polymers don't corrupt their culture and that they don't use it for anything other than self-defense, I think it's ok for Na'vi to carry guns around.