A christian can only follow the law if it is line with God's law. Once Man's law is in conflict with God's law you are required to deny it's validity and not to follow that conflicting law.
The Shiavo case is just such a case. In order for this judge to justify his decision to order the removal of food and thus kill Mrs. Shiavo he has to hide behind an unjust law.
He knows it is wrong and still will not repent (change his mind) and rule in accordance with God's law. IMHO the church is absolutely correct to ask him to leave until he repents and seeks forgiveness.
Unless he has a true change of heart and seeks forgiveness he is in for a very rude awakening on the Day of the Lord.