Gentlemen, you're starting to forget the question being asked here: Was Picard wrong not to release that virus in I Borg? I say he was. Picard thought he had a sure way to get rid of the Borg once and for all and he didn't take it, thus possibly condemning billions to assimilation (Which, according to Picard's actions in FC, is worse than death). This make Picard the worst kind of coward, he was willing to put the Federation in mortal jeopardy just so he could do the "moral" thing.
It does not matter if the virus would or would not have worked, what matters is that Picard believed
the virus would work. As Picard himself admitted, the moral
thing to do is not always the right
thing to do.