As children, we are often told both what to do and what to think. For a child to learn at all, it must in the first instance simply trust those, such as parents, who teach it things; and this goes for practical as well as theoretical learning. Doubting is necessarily something that comes later, for to be able to doubt one must have some beliefs already, e.g. concerning what sort of reasons count as good reasons, and what count as bad. (...) But in growing up, a person does, or should, develop the capacity for rational doubt, and also the capacity for rational resistance to being told what to do. The first capacity constitutes a critical faculty, and the second is an essential constituent of practical autonomy. (shrink)

I argue that all rights exist by convention. According to my definition, a right exists by convention just in case its justification appeals to the rules of a socially shared pattern of acting. I show that our usual justifications for rights are circular, that a right fulfills my criterion if all possible justifications for it are circular, and that all existing philosophical justifications for rights are circular or fail. We find three non-circular alternatives in the literature, viz. justifications of rights (...) by consequences, by autonomy or by divine commands. I show that all three alternatives fail, and I conclude that all rights exist by convention. This ontological result has a surprising and beneficial consequence. A common argument against conventionalism is that it implies cultural relativism. I finish by showing that the suggested conventionalism is incompatible with cultural relativism. (shrink)