Yes we did let the nazis (most capable men) run wild in the intel world in the name of stopping Russia. You say, “We can debate the morality of it, but looking at the way things worked out 1945-89, the strategy worked”.
Kinda, our nazi infested and sympathizing intel world murdered JFK, and has become the envy of anything Hitler ever wished for.
Lay down with dogs, get up with fleas.
The FBI had friendly relations with organized crime, and the CIA was very friendly with nazis.
Both organizations are now infested with those mentalities of their counterparts. It the same reason you don’t let your honor student go on a road trip with the bad news kids. They pick up the bad habits, they never ever elevate the lower element.