I don't think I quite get the 'social morality' idea entirely. In part, I'm not exactly sure when she becomes aware of her father's moral indolence, though she's well aware of her mother's flaws and shortcomings before Darcy's obvious disdain of them. But is that more acute humiliation at the way her family all show their worse sides in front of him (inevitably!) really some kind of greater morality?

I'm also not sure this was a cop-out (though I have said it was a little bit of a one in F&H, when Polly *twice* gets to say 'thank you for making it easier for me' - consistency, thy name ain't Lady-S!), though the nasty characters are painted more broadly than the nice ones, of course. But there's some pairing going on too, which is significant: Lady Catherine is as much a match-making mamma as Mrs Bennet; Caroline Bingley parades herself in front of Darcy just like Lydia and the officers; and so on. (I think I've lost the plot again...) Anyway, she does give a bit more shading to the caddery in Willoughby's case too, doesn't she? And Mr Eliot, I guess. Mansfield Park I just don't know about, as it's been too long since I've reread, for reasons that don't need repeating atm.