That assumes her origins are completely irrelevant, though, which they aren't.
Unlike the (virtually universal) Christian notion of Jesus being identical to God in some fashion, either via the Trinity or by way of the monophysicite explanation, Hernandez, at least, was born human.
For my part, Christianity sure would be a lot more compelling and meaningful, if Jesus had been born human, and continued to be human up until he kicked it up on the cross. (Thus, the Hernandez part of Destiny is a better story than the canonical Gospels. See, I can be positive.)
Hernandez was born human, yes, but she was no longer human - and this matters much more. She was Caeliar.
Furthermore - the Caeliar (including herself) reached their decision by applying their values; Hernanzed didn't change those. She merely informed the Caeliar that the borg were their creation.
The Caeliar values were relatively compatible with federation values - much more than with klingon or cardassian values, for example - but the federation had no part in shaping these values, these morals of the gods; the 'Destiny' trilogy makes it clear that humans are FAR too small to even consider contributing - in any capacity, with anything - on that level.
Deranged Nasat
Picard - as most of the federation - lost, indeed, faith in his ideals, in himself, etc. But I disagree that Picard was a realist in doing so.
A few in Starfleet didn't lose faith, surrendering to pasivity and fatalism; sadly, exceptions that confirmed the rule:
Ezri, the Da Vinci crew, the crew that stopped the borg at Kitomer. As Picard himself did so many times when faced with insurmontable odds, they sought the creative solution, they thought outside the box, they kept hope alive as opposed to only waiting for a 'dignified' death and not even trying to prevail (the thalaron weapon fiasco being a symptom of this defeatist mindset).
AND THEY PREVAILED. Their actions saved BILLIONS of lives in the end!
Picard knew this. He knew how he himself accomplised similar miracles in the past. Yet this time, he was broken - the borg crushed his spirit, his will to fight for his values, to 'never give up'.
A 'realist' choice? No. Picard didn't lose faith due to some deduction - such a prosaic deduction proved false too many times in the past; he lost faith because he surrendered to his fears, his indecision, his weakness.
It was the federation's darkest hour. It was the culmination of Picard's longest and darkest arc.
This is when the human spark hould have burn brightest. This is when Picard should have proved his value, gained his greatest victory.
And yet, Picard failed completely, on every level. He showed what he is worth - and it was FAR below our expectations. A severe blow to the character.