The bad guys and nut cases will continue to have access so what is the answer? ARM as many law-abiding citizens as possible to give the crazies second thoughts or stop them once they start. First step - arm trained teachers.
Have you and your ilk ever look at the FBI statistics regarding how many times a year that crimes are deterred by lawful armed citizens? Of course you haven't. You just dream of magic pixie dust that will make all weapons go away. While your pixie is dusting, ask him/her to dust away the thousands of Islamists that are being allowed in this country. That will turn out to be a bigger threat to your bleeding heart.
Hillary and those like her consider themselves above the common folk. None of what they propose applies to them.