Operation Barbarossa commenced on June 22, 1941. Of course Pat might say it would have been OK for Nazi Germany to take over Communist Russia.

The destruction of the Jews began as soon as the Nazis took power. Nazi Germany's final solution was planned before the trains were scheduled.

Describing Nazi Germany's mindset as wanted to "take over the world" is a cartoon characterization of Hitler's actual territorial goals. (Look at the quotes from Mein Kampf below. )

Would it been prudent for the US and the UK to forge an alliance with and expanded Nazi nation that could have stretched from the Atlantic to the Pacific Oceans? I don't think so.

What will be the moral blow to civilization is the asinine refusal of the United States to refuse, since the end of WWII, to demilitarize. Our current military spending is indefensible and will destroy us more certainly than any military threat on the horizon.

From Mein Kampf:

The future goal of our foreign policy ought not to involve an
orientation to the East or the West, but it ought to be an Eastern
policy which will have in view the acquisition of such territory as is
necessary for our German people. To carry out this policy we need that
force which the mortal enemy of our nation, France, now deprives us of
by holding us in her grip and pitilessly robbing us of our strength.
Therefore we must stop at no sacrifice in our effort to destroy the
French striving towards hegemony over Europe.

Without respect for 'tradition,' and without any preconceived
notions, the movement must find the courage to organize our national
forces and set them on the path which will lead them away from that
territorial restriction which is the bane of our national life to-day,
and win new territory for them. Thus the movement will save the German
people from the danger of perishing or of being slaves in the service of
any other people.

From the past we
can learn only one lesson. And this is that the aim which is to be
pursued in our political conduct must be twofold: namely (1) the
acquisition of territory as the objective of our foreign policy and (2)
the establishment of a new and uniform foundation as the objective of
our political activities at home, in accordance with our doctrine of
nationhood.

But when we speak of new territory in Europe to-day we must principally
think of Russia and the border States subject to her.