Not at all. Many of Hitler's associates were remarkably intelligent (IQ scores):
1 Hjalmar Schacht 143
2 Arthur Seyss-Inquart 141
3 Hermann Goering 138
4 Karl Doenitz 138
5 Franz von Papen 134
6 Eric Raeder 134
7 Dr. Hans Frank 130
8 Hans Fritsche 130
9 Baldur von Schirach 130
10 Joachim von Ribbentrop 129
https://en.wikipedia.org/wiki/Nuremberg_trials#Intelligence_...