You know why gas became the Nazi's favorite thing? Because Himmler, wanting to see an execution in person, ordered an old-style firing squad of 100 in Minsk in August, 1942, and almost fainted. When two Jewish women weren't killed immediately by the bullets Himmler "became hysterical." It was hard on him. (Shirer The Rise and Fall 962-3) 

Never been anything like the Nazis, guys, never.