My wife and I were just discussing this. There are two factors: Doctors/Hospitals and Families. As to doctors, most of them have bought into the culture of death. If you listen to most experts, even on FOX NEWS, it isn't their medical knowledge that is sought, it is their moral ethics or the lack thereof (or the fancy word bioethics) that is sought out.
The problem with families is this. Probably a third of the families in this country don't get along that well. They are kinda glad when their mother/husband/daughter has gone to the grocery store so they don't have to be with them. They fight all the time or secretly wish them harm, though they would never lay a hand on them. But when an opportunity comes and a doctor supports them - Bye Bye!
This being human nature - it is only a culture of life (Respect for the Sixth Commandment and the Fear of God) that will keep us from killing each other.
Before that happens there has to be a radical change, first in the Church in western culture, and then in the culture itself as influenced by a real Church that can demonstrate that the emptiness of postmodernism leads to disaster. It might take disaster in the form of either a totalitarian left establishment or totalitarian right establishment.
If you have ever read Francis Schaeffer's book, The Church At The End of The Twentieth Century, he describes and predicted what we are witnessing right now in the culture of death.