"thus proving that the original "futile care" decision was the correct one."
Denying medical care to a sick person isn't justified simply because they died while still receiving care. We all go naturally at some point. There's a distinct difference between Ms. Clark's natural death and the hospitals desires to kill her.
Murder by ommision is never a "correct" decision.
Your hyperbole is not applicable to the discussion. Hospitals are free to determine who they will treat and who they will ask to seek care at another facility. An ethics committee at Houston Hermann Hospital made a decision that Ms. Clark was terminal, and that another facility would have to be sought for long-term care for her.
The decision was delayed, and during that delay, Ms. Clark died. It appears that, in fact, she was terminal.
Hospitals always give families the option to find a facility that will provide the care they need for their loved one.