If you're telling prescriptivists to stop prescribing, aren't you being a prescriptivist for descriptivism?
Descriptivism lets language evolve. Prescriptivism (people trying to push it back) is part of that evolution. According to your principles, you should just accept it as the way the language evolves.
Prescriptivism provides the foundation for descriptivism's point of departure, and descriptivism provides for the evolution of language. They are part and parcel to each other.
Descriptivism lets language evolve. Prescriptivism (people trying to push it back) is part of that evolution. According to your principles, you should just accept it as the way the language evolves.