Fascism was in large part a reaction against communism and socialism, which were the dominant alternative at the time. Many people who had a lot to lose from the rise of the worker's movement, the Weimar Republic, the SDP, etc. very "rationally" supported the Nazi party. Look up e.g. Fritz Thyssen. Similar story in Italy, and very explicitly strongly so in Spain.

My point isn't that fascism is a good or reasonable ideology. But that many people's reasons for supporting it weren't just emotional. Also that their support for it wasn't necessarily or primarily racial in origin, but based in strong anti-communist, nationalist beliefs, instead.