"Enough! Mr. Killian is a righteous person. He couldn’t possibly do such a thing!"
Gavin saved her when she was ambushed this morning. He also gifted her a precious Panax root when he found out Regulus was sick. He even ordered his men to get Dustin released after he was sent to Azkaban.
With such a warm and caring nature, how could he possibly be a bad person?