Ignorance is a disease curable with facts, and the Congressional Research Service (Nov. 14, 2012) reports that from 1994 to 2011, firearm numbers increased from 192 million to 310-plus million, and that from 1994 to 2011, firearms-related murder rates decreased from 6.6 to 3.2 per 100,000.
If murder rates decrease as gun numbers increase, then banning guns is not the answer.
People who commit traditional murder apparently are different from mass murderers. There is no consensus among psychiatrists on what, if any, mental-health problems mass murderers might have had or what might have triggered their horrific attacks.
There are two problems here, traditional murder and mass murder.
Banning guns is not a solution for traditional murder and it has not been shown how banning would have prevented any mass murder.