State Bill Would Allow Guns on Campus

After reading an article published in the New York Times about a state bill in Arizona, it kind of makes me wonder what our world is coming to. The bill which proposed the right to these qualified to carry their concealed firearms on university campuses.
"Ms. Johnson, a Republican from Mesa, said she believed that the recent carnage at Northern Illinois University could have been prevented or limited if an armed student or professor had intercepted the gunman. The police, she said, respond too slowly to such incidents and, besides, who better than the people staring down the barrel to take action?" Originally Ms. Johnson wanted the bill to cover all aspects of education including kindergarten, it was later said to include only higher education. To my personal surprise Arizona is not the first state to propose this kind of legislation.
"The Brady Campaign to Prevent Gun Violence, a Washington nonprofit organization, said 15 states were considering legislation that would authorize or make it easier for people to carry guns on school or college campuses under certain conditions. Those states include Alabama, Indiana, Kentucky, Michigan and Virginia, according to the center, but it considers the Arizona proposal particularly egregious because it would not only allow students and faculty to carry such weapons, but staff members as well."
This seems like a really bad idea to me, opening the door to the possibility of more violence by arming more people. Who's to say that people won't take matters into their own hands when dealing with personal problems and use this bill as a scapegoat? "The critics of such laws predict that they would cause more problems, including making it hard for the police to sort a dangerous gunman from a crowd of others with guns. They also argue that the guns would make it easier for people barely out of adolescence, or perhaps emotionally troubled, to respond lethally to typical campus frustrations like poor grades or failed romances."