No, they don't. There's your mistake. They don't want to regulate guns in Rwanda, or Sierra Leone, or mountain Pakistan. Too difficult. They just want to regulate guns in the fat, rich, stupid, tax-paying USA.
Low hanging fruit. Its a bit like the old joke about the guy looking for his lost keys under the street light. When asked where he lost them, he replied, "in the alley, but I'm looking here because that's where there's light."
You're right. The UN is so fat, bloated and corrupt, that if it was a person, he couldn't regulate his bowels.