Who do you blame the most for the death of James and Lily Potter? Voldemort, who performed the killing curse, Wormtail, who betrayed the Potter's hiding spot/location to Voldemort or Snape, who told Volfemort about the prophecy, which made Voldemort want to go after Harry in the first place?
I put them in this order:
1. Voldemort - well, he did kill them, and started the whole war and everything, right?
2. Wormtail -the bastard, if it wasn't for him James and Lily would still be alive.
3. Snape - even if Snape hadn't heard the prophecy, Voldemort would have gone after James and Lily when he got the chance, they were to powerful and to valuable to the order to be kept alive.
I dont think it was snape, theres this whole thing glying about that snape loved lily. Seems believable to me. and the theory that dumby told him to kill him.
Okay, but that still doesn't stop the fact that Snape told Voldemort about the prophecy. And I seriously doubt he loved Lily, that's stupid, where's the proof of that? If he loved Lily then how come he called her a Mudblood and didn't want her to help him ever when James and Sirius were bullying him?
Sometimes no information is better then half information. Yes, Snape did tell VV about the prophecy but he did not tell him the whole information, what resulted withdeath of Harry's parents and almost killed VV. The downfdail of VV gave time to DD and the order to prepare for his return. So I blame Wormtail