Continuity mistake: When Karen finds Terry's corpse, there is nothing visible on her, and half her body is shown. In the next shot a white blanket is suddenly on her body, all the way up to her neck. (01:03:15)
Continuity mistake: When Eddie is transforming into a wolf in front of Karen his left hand turns grey and grows hair down to the knuckles. Then in the shot of his arm muscles expanding, his left hand has a normal skin color and hair only down to his wrist. Apparently, while editing no one checked to see how his hand was already established. (02:09:55)
Answer: He hated the way they were living. Acting human, hiding who they truly were, integrating into "normal" society. He wanted to be wild and free. When they were feared and worshiped.