"Greer made an erroneous decision based on the facts in my view, helped along by poor lawyering on one side."
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There was NO convincing evidence anywhere close to beyond reasonable doubt about Terri's wishes. There was also no "clear and convincing" evidence about Terri's condition.
The finder of fact can give such weight to conflicting testimony as the finder of fact wishes. Greer was God, in practical effect. The abuse of discretion standard as a basis of appeal almost NEVER succeeds. You don't like it? Change the law.