Push the button, exterminate the superhero, personally verify they have been destroyed, double the guards against ensuing retaliation. Personally re-read the ancient prophecy, consult with your trusted advisers and listen to how the situation could have been better handled. Keep on the look out for the next (there is always a “next”) chosen one. Stay prepared.
The most powerful weapon the forces of Good have against the forces of Evil is evil’s seemingly endless supply of hubris.