I think there's a ton of truth to that; for example, the Jews provided a very convenient excuse for the loss of WW 1 and the overall current (perceived) plight

I think there's a ton of truth to that; for example, the Jews provided a very convenient excuse for the loss of WW 1 and the overall current (perceived) plight of the German people. But I think this common explanation oversimplifies what was clearly a complex issue. Hitler may not have had a concretely defined notion of what was Aryan and what wasn't, but he did have a strong notion of superiority and inferiority, as did most of his followers.