I was just thinking about the plot a bit, and it seems to me everything is Snape's fault. Obviously he is the one that brought the overhead prophecy to Voldy, but I mean more than that. When someone dies trying to save someone else, it is not enough to trigger the protection that Harry enjoyed for most of his life. The books are specific about that. The reason Lily was able to protect Harry is because Voldemort gave her a choice. If she had stepped aside, he would have killed Harry and left. This is why when James threw himself in front of the Dark Lord, also unarmed, and was killed, it did not protect his family. The Dark Lord didn't give him a choice in the matter, he had every intention of killing him one way or the other. Lily on the other hand was given the specific choice to stand aside (you silly girl!), and instead she kept herself firmly between them and ultimately led to a self sacrifice, and this is what imbues Harry with the protection that "killed" the Dark Lord right afterwards, and led to the creation of the unintentional Horcrux. We see this again in book 7. Lots of people die fighting or defending others, some unarmed, but it never creates this magical protection of others. That only happens when the character is given a choice to be safe in a specific context, yet they choose to sacrifice themselves instead. It happens in the end of the last book. Voldemort basically gives Harry a 1 hour free pass, saying he will not hunt him or hurt him for an hour, and he can choose to stay away, or he can choose to present himself in the forest. Harry makes the choice of self sacrifice (had he waited the hour to be up, or shown up in the forest to fight, neither would have led to protecting his friends). Ok. So hopefully we are agreed what goes into the protective magic. Back to Snape. He is the one that requested the Dark Lord spare Lily that night. 1. It is because of him that Voldemort goes after Harry in the first place. 2. It is because of him that Voldemort offers Lily the chance to live, and ultimately enables her to protect Harry 3. It is because of him that an inadvertent Horcrux gets created in Harry So basically Snape started everything, not just the events that lead to the death of Harry's parents, but ultimately the events that lead to Voldemort's death too. It is all his fault. Ok, glad I got that off my chest.