Did those scientists have much choice about joining the Nazi party? And, once in the US, didn't some of them contribute significantly to the NASA space program? Why the hate then?
It's not just the scientists. Check out Erich von Manstein. NATO commanders routinely attended the birthdays of this Wehrmacht general, and behind the scenes he was the unofficial commander of the WestGerman military for years.
A lot of those nazi scientists were defectors and saboteurs, for example Walter Dornberger, a Nazi General, was directly implicated in a plot to assassinate Hitler with a bomb briefcase referred to as "Operation Valkyrie", but sadly only managed to singe his pants and rupture his eardrum.
Some of these men were good people, directly opposed to the evil that gripped Germany.
That aside, though, the list of names of Nazi recruitments from Operation Paperclip is very long, and I'm sure many of them were very bad people.