I'm of the Franklinite school of thought that if you give up liberty for security then you have neither, so I can only think of times in which gun control has been counter-effective.
Fun facts: Lincoln, then FDR was the first president to violate the 2nd Amendment, then LBJ, Nixon (if I'm not mistaken) then Bush 41, then Clinton.
Fun facts: Lincoln, then FDR was the first president to violate the 2nd Amendment, then LBJ, Nixon (if I'm not mistaken) then Bush 41, then Clinton.