If Schiavo had allowed her true family members to make the decision, it would have remained private.
Her next of kin, according to long standing law, was her husband. Most of the time, family members and doctors can work out these decisions without the intervention of anyone else. In the event they can't, the local court was there to hear all sides and make a decision.
You can disagree with what was done, but we don't write law for each individual case. The question is was the process a fair one or do you want to change it? If you would change it how?