There may well be parallels between our "noble experiment" of alcohol prohibition and gun bans.
During Prohibition, the amount of alcohol consumed actually went up as people substituted beer for hard liquor. The parallel: criminals might turn to machine guns if semi-autos are just as hard to obtain.
During Prohibition, the rate of incarceration exploded. In 1919, there were around 4,000 federal convicts. In 1932, there were over 26,500. We can expect a similar explosion in the prison population under gun prohibition.
The murder rate per 100,000 went from 6.6 to 9.9 between 1920 and 1933. Under gun prohibition, we can expect the 20 year trend of decreasing murder rates to be reversed.
The big question is whether we are capable of learning. Our forefathers were humble enough to realize that alcohol prohibition was an unmitigated failure and reversed themselves. I see no such humility among the insufferable do-gooders of today.