The appropriate balance between listening and tolerating anothers ideas

What is the appropriate balance between allowing one to defend his or her ideals and tolerating one's ideals, their hysteria even? In the events leading up to World WarII, Hitler being a war veteran was a popular figure being able to persuade a crowd of people to do as he wished and having his ideals tolerated by people who hated him. In the end he gained to much power making himself a hysteric man. his people tolerated and hid from his hysterical ideals of slaughtering an entire race of people. Anne frank a smiling kind hearted girl was one such person who hid from Hitler, she was found in the end though and was forced to a labor camp, forced to work untill death for being a jew.