The gracious things is that Pete realizes where he was wrong and apologies for his blind allegiance, but he never apologized for doing the right thing.   He forgave others, and he performed in concert with Burl Ives near the end of Burl's life.

He appears to have forgiven the aforementioned J.W. as well -

"The speed of [Josh] White's capitulation to right-wing pressure disturbed and puzzled his leftist friends. Pete Seeger, who staunchly resisted HUAC at great personal cost, was shocked by White's HUAC testimony. Seeger could only speculate that White, who was a "ladies' man", must have been blackmailed by the FBI.

Seeger later softened his stance, happy to share a stage with White, but Harry Belafonte, whose style was much influenced by White, was hurt by the betrayal and still remains unforgiving. Others on the cultural left were saddened rather than angry, and sympathetic to the pressures on White, but for virtually all, their relationship with White was over."

http://www.greenleft.org.au/2001/449/26022