Why do lord Voldemort killed James and lilly porter?

Answer 1

Thanks to the incomplete prophecy told to him by Severus Snape, he believed that Harry Potter was the only one who could destroy him. Thus he went to the Potters' house, killed Lily and James, and then attempted to kill Harry. You know what happens after that.

Answer 2

Well, Vodlemort was like a school bully. And he wanted everyone to join his fang in a way. But Lilly and James Potter refused, so he killed them. :(

Answer 3

He wanted to kill Harry and James was in the way

Answer 4

He wanted to kill Harry Potter because of a prophecy that said a baby born at the end of July would have the power to destroy Voldemort. James Potter was just in the way.

Answer 5

Voldemort only wanted to kill Harry, killing his parents would just round everything off. He was prepared to spare Lily because Severus Snape asked him too.