arildno said:
Sure, but where does the limit go?
To stop a murderer, or deprive a neglecting parent of his child are quite different cases from the ones above, since the level of interaction of that person with others is far higher than in the cases mentioned.
In your original post you didn't really give example cases, you listed types of people. All of the types of people you list seem to me examples of people whose judgment is potentially impaired in one way or another: minors through inadequate or incomplete knowledge or understanding, schizophrenics and depressed people and the demented through mental illness.
In the cases I think you may be associating with those types of people, I think that the argument to restrict or supersede their apparent decisions isn't that they are not sovereign agents, but rather that impaired judgment makes it so that they aren't really making the decision that they think they're making. If such a person could be demonstrated to be making a decision in sound mind and with full understanding I don't think it would be just to ignore or override their wishes.
Similarly, someone who on average is normally an adult of unimpaired judgment might temporarily be in a state of impaired judgment: through drugs, an injury such as a concussion, emotional stress from something like extreme grief, sugar imbalance á la the Twinkie Defense...
arildno said:
But, we can reasonably argue that a self-loather who in a fit of self-contempt harms himself only affects himself through that action.
So in that case the idea isn't that it's okay to prevent people from making choices that harm themselves, it is that the "self-loather" is in some mental state that results in impaired judgment - and
that is the source of the apparent decision to harm themselves, not genuine sovereign will.
If you are choosing to harm yourself out of sovereign will - say, ruining your lungs through smoking or wrecking your knees through playing professional football or volunteering for a suicide mission in the military - that's not something it's okay to interfere with.
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