The Son of God became a man to enable men to become sons of God. " ~ Mere Christianity, By C. S. Lewis
There are important arguments to be made about the relative merits of an hereditary or an elected head of state: but not at the level of the human frailties of particular monarchs or presidents. No one seriously contends that the American presidency should be abolished because Bill Clinton is a self-confessed adulterer. So why should the abolition of the British monarchy be contemplated because the same is true of Prince Charles?