There's also the subjectivism of taste, sometimes known as consumer sovereignty (the idea, from David Friedman's The Machinery of Freedom, that a person's own good is defined as whatever he says it is). Not believing in that leads to outbreaks of senseless and counterproductive nannyism, whether carried out alone or with the help of authorities.
I assume that what you mean by "whatever he says it is" is whatever preferences his choices reveal, not literally what he says it is.
Believing that a person's good is literally what they say it is can just as easily lead to "nannyism", if we decided to prevent people from acting against their own good.
Here's the new thread for posting quotes, with the usual rules: