Then how do you justify incarceration?
So life or freedom are "privileges", not rights. Guess there are some people on death row that would be surprised to hear that.
Certainly you can. Felons give up the right to association, the right to travel freely, the right to vote -- many rights. In our system of crime and punishment, felons PERMANENTLY give up many rights, since the felonious act (by our definition) brands them forever. We look to the courts to determine which of these rights are to be restored subsequent to incarceration (as in the case being reviewed about "Megan's Law"). There is no inherent argument that says that Rights can't be forfeited in the case of criminality and that there is a constitutional guarantee of restoration.