If anything they have been restricted. I claim that it is the moral repugnancy of the left, led by the Johnson administration and the Supreme Court of the 60's, that has led to the decay in American culture. Our political and legal culture has been in a downward spiral ever since. Every change at the hands of the liberals has brought untold harm to the family and self responsibility. Guns are a means to an end.
Problems start at the root.
Guns have been available for hundreds of years. The power of the guns doesn't matter. The kids at Columbine used rifles and handguns that have been available for years. There can be no case made that because the guns are more powerful, there is an increase in aggressive behavior to use them. The decay of our culture is to blame.