Guns, madmen, and voters

Last night, October 1, 2017, a madman in Las Vegas killed at least 58 people and wounded hundreds before killing himself. He used some sort of automatic weapon. Why are these weapons available? Why are they legal? Their only purpose is to kill lots of people fast. Why do we permit civilians to purchase these weapons.
The second amendment guarantees our right to bear arms. As silly as that is in today's world, it need not include any weapon more powerful than a single shot rifle or a six shooter. Most who disagree have not had a mother, father, brother, sister or friend killed by a madman.
On December 14, 2012, another madman killed 20 elementary school children and 6 teachers and staff before killing himself. Close your eyes, picture sending your child off to second grade, and then imagine the phone call.
On an average day in America 93 Americans die from gun violence. Almost 12,000 Americans die from guns each year....not overseas, not in war, but here at home. That is almost double the number of Americans who died in Iraq and Afghanistan over fifteen years. Let me be more clear. Since 911 Iraqi and Afghanistan fighters have killed 6,831 American soldiers (I just googled it). Since 911 Americans have killed about 192,000 Americans with guns right here at home.
While 80-90 percent Americans want stricter gun control laws, only about 55 percent of Americans want a ban on assault weapons and high capacity ammunition clips. You would think this is a no-brainer. Assault weapons are bad for your health....like cigarettes, booze and drugs. Ah, but there is a key difference. Cigarettes, booze and drugs only kill the ones using cigarettes, booze, and drugs. Guns kill the other guy. Maybe the madmen aren't the shooters so much as the voters.