Exactly. He was their Head of House. He was supposed to care about them. They looked up to him! Silly me for assuming that the alpha of a despised group might feel some solidarity with that group, or that his favoring the kids who everyone else had written off as irredeemable was a clue that he was a good person at heart. And let's not get started on his relationship with Draco, who needed him a sight more than Harry did.

Yes, apparently he liked him in school, but it was a shallow thing that didn't matter--not anything that would really make him feel like he wanted to act like a father figure. Which is pathetic since Draco could have been the son he would never have, but no. If he wasn't Lily's and if he had a dad, what difference did it make? In fact, go ahead and encourage him to be a DE, since that's basically what Snape was, even if he was betraying them at the same time.