Yes.
Less people, less violence.
There's a reason why almost every scifi game and story have the exact same plot for the badguy. ...scrapping the "less violence" part.
Until we can 100% guarantee that
all guns coming into/leaving anywhere can be registered, no amount of 'gun control' legislation will do anything. To me, that's like trying to collect all the sand with a bucket with a hole in the bottom.