The bombings occrued in the 1970s (the Pentagon was bombed in 1972). He was a 1970s terrorist. Just as the Unabaomber was.
OK, I agree with you now.
He was an activist in the sixties, he did that one, less substantive bombing in 1969, but his real terrorist activities and identity are from the 1970s.
He is either a 1970s terrorist or a terrorist from the 60s and 70s, but he is not a 1960s terrorist.
It took me a while but I very much agree with you now.