I am sure Dr. Keyes loves his daughter very much. But he isn't going to change his beliefs and principles because his daughter doesn't adhere to them, nor will Dr. Keyes support behavior that he believes is very wrong, by supporting his daughter. If Maya doesn't want to respect and abide by her father's rules while living in her father's house and being supported by her father's earnings, Doctor Keyes is not required to maintain his end of the bargain.
In my humble opinion, Keyes' way of handling the situation is far more honest than the Cheney's. You don't change your own moral beliefs because your children have gone astray.
However, both families are entitled to deal with such problems the way they see fit. Regardless, I still respect both the Cheneys and the Keyes'.