EVERY state in the union that has adopted a conceal carry law has seen armed robberies drop, because the bad guys don't know who has a gun.
In Illinois where I live we are the only state to not adopt the concealed carry law. One man tonight on the news stated there are more people killed every year on the South and West sides of Chicago than in Afganastan.
This is sad, if people shot back at the a-holes this would drastically decrease.
OH!! by the way- if we did not have guns another weapon would be used. The headlines early in the morning was a knife attack in Japan that killed or injured 22 people. The CT. shooting took that headline away.