I agree. One or more persons carrying could have made such a difference. No one is talking about playing Batman, but protecting others WHILE protecting your family.
The problem is, the liberals always scream to "get rid of all guns" like that would work as good as "let's get rid of drugs". You will never convince liberals that to stop this, first we need to recognize and treat the mentally ill in this country and that with a firm majority carrying concealed weapons will reduce carnage.