You're going to need a source on the claim that most violent crime is in the furtherance of other profitable crime? You ever heard a phrase such as "if weed were legal then people wouldn't kill each other selling weed"? I thought this was settled science. Is it so outlandish an idea that most people who kill do it because it is profitable for them to do so that you want me to google it for you?
Alright, so let me ask you, what does "common sense" gun control look like?
It would take a constitutional amendment, something that isn't going to happen.