Earlier quoted context omitted.
How exactly? IMHO, sf would be a lot safer if the criminals would have at least the concept that someone could respond to their violence with equal violence. Today, aside from the slim chance of being caught by an unengaged police force, the cost is zero.
Are... you seriously suggesting that if it was easier to get guns there might be less violent crime?
So yes, if people who follow the law can equalize force with criminals, the criminals would consider more careful applying their force indiscriminately.