Friday the 13th Part VII: The New Blood (1988)

Revealing mistake: When facing Jason after he throws Melissa with an axe in her head, you can see that the eye holes on the mask he wears are covered with black cloths. (01:13:50)

Mortug

Russell: When did you first fall in love with me?
Sandra: The first time I saw the enormous size of your beautiful... wallet.

Trivia: During his four-movie tenure portraying Jason, Kane Hodder actually put a lot of thought into the character, and developed what he thought Jason's personality would be in order to give himself motivation for the role. Hodder also created a strict set of rules that he would follow while playing Jason. For example, Hodder felt Jason would never hurt animals, since he had a childlike mind and wouldn't want to harm a creature he saw as inherently innocent. And more importantly, Hodder insisted that while he played the character, Jason would not harm or go after children, since he "drowned" as a child and recognizes them as being innocent like he was. While the rules do somewhat contradict earlier films, Hodder stuck by his guns.

Question: Why was Dr. Crews such a two-faced, corrupt, dishonest and manipulative person? He never intended to help nor cure Tina but wanted to exploit her abilities for sake of his own career, to the point of deliberately aggravating her. He was a psychiatrist so why was he so evil?