Funny thing is that most people who are locked up aren't locked up for crimes committed with a gun.
Guns don't cause crime.
Um, yeah, because we have 400,000 gun crimes a year, and only room to lock up 2 million people. That's why we can't lock up every idiot caught with a gun when he gets busted for dope.
We also don't lock up most people caught with drugs, or most women who are busted for prostitution.
Now, gun proliferation is only one dimension of the crime problem. The others are addiction, poverty, mental illness, racism... and we are in no hurry to solve those, either.