The US didn't "help" the German scientists "escape". They captured them and took them to America where they could continue their research - for the Americans. The Russians did the same with the ones they captured (compare the Mig-15 with the Ta-183.....) The last months of the war there was a race between the two to scoop up as many German scientists as possible - most of whom were trying to flee west to surrender to the Americans. Werner Von Braun is one of the most famous.

However, to say that just because they were scientists meant that they couldn't be Nazis is a little disingenuous. I'm sure some of them voted for Hitler.