I assume the above quote date is correct, 1960. This is before the freedoms of this society were questioned and exploited by the Left after the assassinations of JFK (63), RFK, MLK (68). All three assassinations were committed by persons of very doubtful mental stability, and in the case of Oswald there was ample warning his magazine was shy a few rounds.
Most of the Left still focus on symptoms of society's problems rather than cause, such as their erroneous theory that poverty causes crime. It doesn't! Crime IS the cause of poverty.
Assassinations are not caused by guns, but by the mentally ill. From Gabriel Princeps, who shot Archduke Ferdinand, to Dillon and Klebold at Columbine, and all those in between, it has been our ability to ignore the mind sick assassin in our midst. Rather than a lack of gun control, it has been society's inability to control violence by not recognizing those that are violent. That is the real killer.
Maybe someone from MN can clarify.