Also, we have attempted to address the issues with tobacco and alcohol. We have put limits on the ages at which one can buy these things, where they can be used, stepped up the liabillity of people who provide alcohol, etc. I remember when everyone smoked everywhere. Then we started learning about second hand smoke, and went to smoking sections in restaurants and airplanes. Learned more, changed more. Now you can't smoke indoors just about anywhere, can't buy alcohol until you are beyond the age of legal majority. There are taxes levied on the users of these things to help with the problems that arise from their use. What has been done about gun violence, specifically these mass murders? Crickets.