Canada has a lot of guns (not nearly as many guns as the US of course), far more guns than most European nations. It has a far lower gun murder rate than the US. There are other factors in play than just whether guns are forbidden or not. For example, gun laws and the nature of those laws (or lack thereof).

Finland, Norway, Austria, France, Iceland, Germany, Switzerland - seven of the top 20 nations when it comes to guns per capita.

It's the nature of the gun laws, not the forbidden or not forbidden aspect, that plays a far larger role.