Question

What conspiracy theories arose in Germany post-WWI? What were these “theories” based on?

Answer 1

A very common theory that is still rampant today is that not as many Jews were murdered. Lots of people believe that the Holocaust was "overrated" and didn't take anywhere near 6 Million lives. This comes from pure anti-semitism; denying that it happened or that it wasn't as bad as told makes it easier for people to not think about its effects and how it still has an impact on Jewish people today.