

His choice to kill Dumbledore meant that Draco didn't have to - and the child who was tasked with murder was spared the need to follow through. Snape was not only able to prove himself to the Death Eaters, keep them safe, and work behind the scenes to try and keep Harry safe (and give him back the Sword of Gryffindor, which came back into his possession as Headmaster), but he was able to fulfill Dumbledore's wishes. However, by the end of the series, it's clear that this was an excellent choice.

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This may seem like a terrible choice - Dumbledore is a beloved old wizard, a father figure to Harry, and a defenseless old man in this moment, and yet Snape kills him.
