Why did German citizens not stop the Nazis when they were persecuting the jews when they saw that was evil? Because, to the Germans, the Nazis were not evil. Thanks to the Nazis, their economic livelihood improved (basically because the Nazis took from the Jews and gave to the non-Jews). To the Germans, the Nazis were not evil.
It is the legislative branch that received the most power under the Constitution, since the Founding Fathers wanted to make sure that only elected officials carried the most power to avoid the rise of tyranny.