With all the wonderful gun registration and other restrictive type laws in place, there should be LESS violent homocides in Brazil, Mexico and South Africa than the US. This is the main point. Crime is very low in areas "swimming with guns" such as Liechtenstien, Switzerland and Wyoming. Hell-holes like the Sudan, the Ivory Coast and Liberia have just as many guns but have dead bodies laying in the streets.
If anything is "spurrious" it is data that can not and will not predict crime based on gun control laws worldwide.