for example, there's no need for a right to free speech if you're only going to say things that everyone thinks should be said.
rights exist because some things are so important they are worth the cost of abuse.
At first blush it may be thought surprising that one should have a right to do that which one ought not. Is it not better to confine rights to that which it is right or at least permissible to do? But to say this is to misunderstand the nature of rights. One needs no right to be entitled to do the right thing. That it is right gives one all the title one needs. But one needs a right to be entitled to do that which one should not. It is an essential element of rights to action that they entitle one to do that which one should not. To say this is not, of course, to say that the purpose or justification of rights of action is to increase wrongdoing. Their purpose is to develop and protoect the autonomy of the agent. They entitle him to choose for himself rightly or wrongly. But they cannot do that unless they entitle him to choose wrongly. - Joseph Raz, The Authority of Law (p 266)
the final sentence of the quote above is hugely important.