Yeah, but Sirius hates Snape for intentionally aiding the Dark Lord (who is coincidentally the reason he grew up in a household of hate), eventually leading to his best friend(s) deaths, and Sirius going to Azkaban for most of Harry's life. Then, he comes out to find that Snape is a Professor at Hogwarts, in direct contact with Harry, and that the man singles out Lily's son repeatedly. Add into that the series of events involving 3rd year (when Snape tried to out Remus as a werewolf and would have likely been glad to see Sirius given the Dementor's kiss) and you can see why Sirius wouldn't be able to let it go. In his opinion, Snape ruined the Marauders intentionally, and only felt bad because Lily was his childhood friend/crush. If everyone else died and she lived (at least in Sirius' mind), Snape would have been tickled pink.

James' childish frustrations with Snape pale in comparison to Sirius' adult grudge, but if Lily would have died and James lived, I doubt James would have been willing to 'forgive and forget' either.

TL;DR: Sirius has plenty of reason to hate Snape, and truly, Snape deserves every bit of it. If he had been, I don't know, even slightly apologetic about the circumstances of becoming a Death Eater and inadvertently killing off the Potters, MAYBE Sirius could have let it go. Personally, I wouldn't have let it go, so Rowling's characterization of Sirius as unforgiving/would do anything to spite Snape is spot on.

 

No, Snape felt guilt for the way he acted to end his friendship with Lily.

I originally came across the idea I brought up here on DLP, but upon searching, I haven't been able to find any official comment on it, so I'm doubting it now.

 

Old thread is old. The rabbits won.

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