Totally he was risking his life to save Harry Potter. Well really he loved Lilly Potter but she died so he saved Harry. He was a spy for Dumbledore he pretended to be a death eater but he was really a good guy!
without lectura the libros and only watching the cine he looks bad but once tu read o see his memories you'll realize that he isn't as bad as he was made out to look so I'd say no he's helped Harry through the years más then hurt him