I have always thought it was because of his exposure to it during WWI, but considering the man actively gassed civilians without a qualm and seemed to hate communism almost as much as Judaism, it’s always baffled me that he never ordered the use of chemical weapons, especially in or around Stalingrad or as the Soviets approached Berlin. Why?
/u/Georgy_K_Zhukov has previously answered Why did Hitler’s Germany not deploy chemical weapons during WWII?
/u/commiespaceinvader has previously hosted a megathread about Nazis, Chemical Weapons, and the Holocaust as well as Meta On Adolf Hitler, great man theory, and asking better historical questions
PS It is very hard if not impossible to prove a negative.