I hate to sound harsh, but I don't really care what the commentary says. Sela is clearly not to be trusted, and I see no reason at all to take her at her word. I don't even care that she was only 4 when she effectively killed her mother. The least she could do was show SOME remorse.
You are entitled to disregard the audio commentary but then it's your personal preference versus the intentions of the creators. I think the method of scriptwriting sufficiently establishes the accuracy of Sela’s account:
- Picard discusses the validity of Sela’s claim with his staff and finds no common sense reason why it should possibly be a deception (as it will have no impact on their current situation)
- Next, Guinan (trustworthy) walks into the Conference Lounge to inform Picard that he (in an alternate reality) “sent” Tasha to the past, which sufficiently explains why Sela’s existence is possible
- Finally, Sela walks in and she, too, tells Picard that he “sent” her mother to the past, thus establishing the credibility of her account
But here she shortly enjoys a moment of advantage (knowledge) which quickly goes south, once she talks about it and remembers how lonely she probably felt after her mother’s execution which was a consequence of her crying, when she was just four years old.
She would be the last person I’d expect showing “SOME remorse” (= weakness) vis-à-vis her adversary (Picard), who realizes (“doubts”) that her human half is apparently not as dead as Sela wants to make him believe.
Having suffered humiliation in the presence of Picard here and again in “Unification”, Sela would have been a Romulan character eager to see Picard fail somehow and for a change, but TPTB didn’t pull that option, unfortunately.
It is possible, though, that a Vulcan aged 20 to 25 is not expected to have such total emotional control--it would explain Spock's emotional displays in "The Menagerie." For a race that lives a quarter of a millenium, full adulthood might not be reached until the thirties or so. Saavik's tears--like Spock's grinning at the Talosian flora and exclaiming "The women!"--could be chalked up to adolescence.
But according to “Yesteryear” it’s rather unlikely:
BOY: Earther! Barbarian! Emotional Earther! You're a Terran, Spock. You could never be a true Vulcan.
…
SAREK: My apologies, visitor. I regret you were witness to that unfortunate display of emotion on the part of my son.
Already and for children at the age of seven, Vulcans consider emotional display as distasteful and inappropriate.
And Saavik certainly knew that Spock would have found her tears for him somewhat disrespectful. From a Vulcan point of view what was there to cry about? Spock had died an outspoken “meaningful” death saving his ship, his crew and his friends.
But obviously Saavik hadn’t mastered emotional control yet, and at her age that looks almost impossible for a female Vulcan supposedly having been raised on Vulcan.
Bob