Peter, the original Alpha, was always, and is still a rather sympathetic character. Consider what he went through, being burned alive, the majority of his family dying around him as the blaze consumed them with the house. Surviving that, going through nearly ten years of skin grafts, and other painful procedures. All this ,and the process of becoming an alpha might've led him to becoming unhinged. But still, up until he went after Allison, the "victims" were all responsible for what happened to him ,and his family. So as Bubba said in KILL BILL Vol. 1, "There is someone who entilted to their revenge." Heck he could've killed Styles after the kid did his job for him, buthe let him go, and even offered him the bite for services rendered. Hell, the real bad guy in the first season was Kate, whose arson triggered everything. And from looking at Girard, she was always her father's daughter.