Everyone points to appeasement failing to stop Nazi Germany, but people are missing the reasons it failed.

Prior to the start of WW2, the USSR tried desperately to build military alliances with France and Britain to encircle the Nazi threat. They were rebuffed at every turn because Germany's development was far too profitable for French and British interests. The French and British might have took on a policy of appeasement, but they also overwhelmingly failed to recognize the Nazis as a threat (instead, they were more concerned about the threat of communism and allying themselves with a communist country).

That's not a failure of appeasement, that's France and Britain perceiving themselves as far more powerful than they really were.