As @DefinitelyNotAPhone@hexbear.net said, there's a huge difference between selectively using Nazis for their knowledge on R&D while keeping them on a tight leash, imprisoning, and even executing them, and what the West did, which involved giving them cushy jobs, erasing their crimes, and putting them in the highest seats of leadership of organizations like NATO. The West loved the Nazis (still does), the Soviets hated them.