N2EY wrote:

The big mistake was not the invasion of the Soviet Union, but rather the twin
classic blunders of dividing one's forces and not being logistically prepared.

I don't know... making "boogie men" out of the most intellectually
gifted, innovating and striving part of his population, then
spending huge amounts of money and resources to exterminate them-
that sounds like a pretty stupid move to me.