Why were communism and fascism so appealing?

Those ideologies happen to be communism and fascism, which together brought an orgy of violence, killed millions, and led humanity to its darkest hour, where the final destination was the deplorable Gulags and the gas chambers of Auschwitz.

In Post WW1 Germany communism was extremely appealing because people were in need of money and jobs. Because people were in such desperate times radical leaders with radical ideas were being listened to. If people could revive a wage no matter what their job was they didn't care what kind of government was in place.