&gt; There are many many contexts in which we, as a society, determine that someone is mentally unfit to make decisions<p>And in many of those contexts those determinations are routinely unjustified, and have resulted in massive institutionalized civil rights violations over generations. You can read Thomas Szasz for heartbreaking details (e.g. <a href="http:&#x2F;&#x2F;www.amazon.com&#x2F;Manufacture-Madness-Comparative-Inquisition-Movement&#x2F;dp&#x2F;0815604610" rel="nofollow">http:&#x2F;&#x2F;www.amazon.com&#x2F;Manufacture-Madness-Comparative-Inquis...</a>). Hopefully someday we can look back on such policies with similar horror to how we now see 17th century Bedlam. Instead of using them as arguments for further authoritarianism.