Another classic left wing excuse. You must know the answer to your question. Pat Moynihan spoke of it often before his death.
I presume this means that definite evidence of the Rosenbergs' guilt now exists. I don't deny that might be the case. I'm not expert. I took this article at face value
"While the transcriptions seemed inconclusive, they forced me to accept the possibility that my father had participated in an illegal and covert effort to help the Soviet Union defeat the Nazis," he writes in his new memoir, "An Execution in the Family: One Son's Journey" (St. Martin's Press)...Mr. Greenglass's chief contribution was to corroborate what the Soviets had already gleaned from other spies, which by 1949 enabled them to replicate the bomb dropped on Nagasaki...The government didn't have to prove that anything of value was delivered to the Soviets, only that the participants acted to advance their goal...But we now know the Soviet cables decoded before the trial provided no hard evidence of Ethel's complicity. And Mr. Greenglass has recently admitted that he lied about the most incriminating evidence against his sister.
The article goes on to say
Whatever military and technical secrets Julius delivered to the Russians — and it now seems all but certain that, as a committed Communist, he did provide information...
But it doesn't say what that information was or how valuable it proved to be.
So I don't know the answer to my question...and I don't know which of Mr. Moynihan's observations you're referring to. I'd like to, though, because he was a man of integrity.