The father is unable to handle hard live situations. Angry ? ? too much. Feel the live is unfear. Want to murder!. He seeking revenge have nothing to lose. His daughter gave him meaning of life again gave him goal to stop thinking bad. It's very strange that he put her in situation where she have to accept sex with him. Maybe it's his way to be come and explain his feelings to her. Or to feel he own her all. It's not good for the daughter she have to be able to find her happiness with man she love. Maybe because he saw her in sad situation like him and decided that.