Why does Snape kill Dumbledore?

Spoilers for near the end of Book 7/Film 8!!!


Dumbledore was already dying, because of the protective curse which had been placed on the ring Horcrux. That was the cause of the blackened arm he had throughout the sixth year. He also knew that there was a plot to have Draco Malfoy assassinate him. He asked Snape to kill him because he was already dying and he knew of this plot - it'd harm Snape's soul less to kill someone who'd asked him to do so, than it'd harm Draco's soul to murder for the first time.

Dumbledore told him to. know your facts!

Okay... Have you never read the seventh book or seen Deathly Hallows: Part 2 or even read spoilers?

Well, Snape kills Dumbledore because Dumbledore himself ordered that.

because draco should have but dumbledore wanted to pretect draco from damaging his soul and snape had already killed people so his soul was damaged already

THANK YOU SO MUCH! I haven't gotten that far, you could have at least put "spoiler alert" for the título of your question. -.-'

Because he is a dick!

It was meant to be Draco but he let Snape do it . And now you know who knows how much Snape supports him