I disagree. I have done considerable research in this area. The CIA, essentially became the successor to the OSS from WW2. Do you have any problem with what the OSS did in WW2? Ambrose had a great account of how Eisenhower utilized intel during the war. The seeds of the CIA were planted long before any Nazis were involved. Though I agree with you that we did (largely due to Dulles' influence) wring what we could from what knowledge they had developed.

The first few CIA directors were patriots and I think even today most CIA employees are patriots. Allen Dulles, however, was a sociopath. It was him that got the CIA involved with programs like Mockingbird and MK Ultra. It was him that got the CIA involved with drug trafficking and arms trafficking. It was him that sat in the cat bird's seat of the Warren Commission and no doubt scrubbed anything that could pin him or the CIA to the assassination of JFK.