That’s not clear at all. The US has more anti-gun-violence activists than anywhere else in the world.
There is some amount of friction, different in each country but not zero anywhere, between “what people want” and “what is the law”. Do you think North Koreans prefer living under a corrupt dictatorship? Why don’t they just make the dictatorship illegal?
That’s an extreme example of course: the US political system is closer to European-style proportional parliamentary systems than it is to North Korea, but it’s still very different from them, and in many meaningful ways is not actually a democracy.