I think one way to reduce gun crime is to change the way they are portrayed in movies, tv shows, etc. People who do not have real gun experience I would think are inclined to evaluate through TV and video games. That would reduce the domestic gun crimes you hear about on CNN.
As for the import/export and war on drugs, (which spleenbe talkin' bout) I think you could reduce gun crime by reducing the penalty for drug crimes. But the politicians want all the "bible thumpers" to vote for them, so it will be awhile.
I believe we have the largest criminal population in the world?
The States has the largest prisoner population in the world I believe.
However, that does not mean it has the largest criminal population in the world.
A lot of countries don't crack down on a lot of criminal activity as much as the States does.
I think the place with the highest criminal concentration is fairly obvious.
Gotham city.