Mass murder of smartest people in germany and Europe, the jews and liberals.
Declaring war against u.s. thinking he could get money from Tojo.
Believing he could actually defeat Russia's 5 million man military.
Hitler had the same problem our present president has. He let his mouth overload his butt. Our president is very good at being too mouthy. It keeps him in trouble and most often makes him a liar.
I remember the advice my Dad gave me the night before I left home at 17. Advice that has taken very good care of me all these years. He said, "Son before you say or do anything, think hard about it before you do it. Remember, if it is wrong, the skin will come off of your butt not mine". Good advice, it has kept me out of a lot of trouble.