At the moment I can buy a beer in a corner store. During prohibition, it was much harder (and more expensive) to get beer (or liquor), and more liquor than bee

At the moment I can buy a beer in a corner store. During prohibition, it was much harder (and more expensive) to get beer (or liquor), and more liquor than beer was consumed at a considerably higher price. One outcome was significantly lower alcohol consumption and all that that means (lower deaths by cirrhosis, lower city drunkenness arrests). If we take prohibition as an analogy, then sure, a dedicated criminal will still be able to get guns. However, a casual street-level criminal is going to have to work harder to get them because they're no longer available in the mall or from the pawn shop, and he's going to have to pay ten times as much to get one from Benny in the pool hall. That'll significantly reduce the number of guns out there, and that is what creates the environment and the expectation that results in cops shooting civilians.