See, I loathed Abyss with a fiery passion. Daniel, asended or not, wouldn't just hang around when his friend was being tortured and killed, he'd do something. Heck, he went nuts when he couldn't help random bystanders.
Actually, that's a lot of what I find interesting about it. Why was that situation different? What was going on in his head? I mean, I agree he's being a condescending git (and let's not forget that his original idea, before offering ascension, is pretty clearly "let's help Jack remember why he's there, so he can tell Baal and then get permanently killed). On the other hand, he's not exactly human anymore, and he thinks he's found the One True Moral Way, which is I think a relief for him. Plus, of course, he is externally constrained.
Anyway, I can see Abyss-Daniel as an extension of real traits he's always had, and showed more and more as the series went on. He always thinks he knows best. It's not unusual for him to choose abstract over personalized morality - look at Scorched Earth, where he's willing to advance the argument that maybe the folks on the ground should be left to die because the germ cells in the sky are the last of their kind, and gee, they're awfully *advanced*, aren't they?
By the time we come around to Changeling he's different, and frankly I think it's Abyss that yanked his head out of his ass, but that's just fanwanking.