I thought we had already established (especially on this board) that the most reliable studies conclusively demonstrate a significant reduction in crime when gun ownership is allowed. That there is still some sort of foolish debate stems from an unwillingness on the left to recognize confirmed facts.
Personally, I believe the lefties are afraid of what they themselves would do if they had a gun. They fear their own lack of control and attribute a similar lack of control to others. And, I think they are probably right to deny themselves gun ownership because they likely do not have enough self control to be trusted with a firearm. But, I personally have owned various firearms for more than 45 years, and carried concealed for more than 15, and I have yet to shoot anybody. Oh, I've certainly wanted to, but that's where that "self control" thing comes into play.
These gun grabbing folks tend to be similar to those who because they are vegans want to eliminate meat from everyones' menu.