I don't think I agree that rights necessarily entail duties. The article states it as a fact but doesn't produce any reasoning why it should be so.

In some cases it is clearly so. A person can't have a right to medical care without there being someone obliged to provide it. However, in the case of the right to an opinion there's no need for anyone to support or uphold that right.

The only major thing that would seem to need to be avoided is criminalising certain opinions.