To a baby-boomer like me, the argument against guns is so ludicrous, I wonder why people spend any time on it. Guns are inaminate objects that have no ability to load themselves, aim themselves, or fire themselves--people have to do those things. In the 60s when I was in high school, when I got off the bus to go to class, I walked past unlocked pickups with loaded .30-30s and 12 guage shotguns in the racks of their back windows and never thought twice about it. Try that anywhere near a school these days and you'd better be getting ready for a drastic change of address.
We didn't think of the guns of the 1960s as ever being used against a human being; at least most of us didn't. Those guns were implements not unlike hoes or shovels--tools used on a farm or ranch. The hearts (attitudes) of people were very different in those days.
IMHO there is a lot less brotherly love these days, compared to the 60s. The problem is not in the availability of firearms--it's in the hearts of people. It's a different world out there today.