Was Professor Snape Good?

During Harry Potter and the Deathly Hallows, Snape uses his Patronus to lead Harry to the sword of Gryffindor. ... After Voldemort killed her, Snape secretly changed sides and agreed to help Dumbledore protect Harry from Voldemort. With all of this, it seems that the answer is clear: Snape is a good person.

Was Snape good or evil?

Snape is evil: He's a Death Eater, he has a longstanding grudge against Harry's father, he's been nothing but nasty to the boy since his arrival, and he's generally an unpleasant fellow to be around. Oh, and by the way, he killed Dumbledore!

Why did Professor Snape turn evil?

He portrayed himself as aligned with the dark side because that was his job as a spy. He had years to ingratiate himself with them, even becoming Draco Malfoy's godfather. So in summary, Snape is so angry with Harry in particular because he is petty in a sense; punishing the son for the sins of a father he never knew.