France criminality rates are much lower than Brazil. And I'm pretty sure that this has nothing to do with gun laws. For multiple reasons which I'll not try to speculate here, average people in France are just less prone to initiate violence themselves than average people in Brazil. They are more "honest", we may say.
My guess is that they are just less desperate. As soon as the french social security system collapses, I'm pretty sure it will quickly get ugly.
It really isn't a matter of France having better security forces or practices, of that I'm sure.
Good point. Gunned violence is indeed not just a matter of gun regulation.