Unlike Unit 731, the scientists in Operation Paperclip were just that: scientists. Their complicitness in the war, while definitely non-zero, was markedly less.*

Unit 731's doctors were more akin to Mengele: personally hacking off living humans' half-frozen arms to see how they reacted in the cold, experiments with gangrene, etc...

Every single concentration camp "doctor" was deemed a war criminal. We didn't import them as a war bounty. Too bad we never did the same for Japan.

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* The only two exceptions seem to be Kurt Blome and Hubertus Strughold, both brought over in Paperclip, who probably perpetrated some nasty shit but were "tried" and given a pass.