Well, there were certainly many people who thought Fascism or Communism was the way of the future. However, Germany's role in the Spanish Civil War, plus territorial aggrandizement (e.g. Austria/Anschluss), treatment of Germany's Jews, etc. during the 1930s hardened British attitudes. Plus the fact that millions were still bitter over WW1. Regardless, Britain's entry into WW2 was a close-run thing, and really down to Churchill. Without him, the Cabinet would have probably cut a deal.