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but anyone who, according to the article, held down a job, had a home, and would seem completely normal to anyone meeting him can not possibly be considered incompetent.

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One word... Congress

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The only way one could call this person, who has for at least 20 years taken care of themselves perfectly well, "mentally ill" is to do so exclusively on the basis of disagreeing with his decisions. Worse, disagreeing with them and being willing to use force to prevent him or punish him from making those decisions.

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Decisions and actions are the primary indicators of mental illness. How do you diagnose mental illness without physical actions that lead you to a conclusion?