Thinking about it more, I think what it comes down to for me is "knowing what you've gotten yourself into". That is, entertainers -- sportspeople, actors, musicians, whatever -- have consciously chosen a profession where a large portion of their job is a perceived identity presented to fans. A footballer's job is to play football, but more than that, a footballer's job is to play football for other people. A footballer who does not play football specifically to entertain other people is called an amateur. A footballer, therefore, has knowingly chosen a profession that involves presenting an identity to a large number of people, most of whom she or he will never meet. Certain things, like getting pictures of yourself in the tabloids and having people write porn about you on the internet, are going to come along with that. The footballer might not like that part of the job much, and might try to keep his or her personal life as private as possible, but, fundamentally, the footballer has knowingly chosen that career, with all it entails.

Someone who is not professionally an entertainer has not chosen that. Choosing to marry someone famous or choosing to become a sports medicine doctor is not the same thing as choosing to become an entertainer. I therefore feel that such individuals should not be forced to provide an identity to fans, which includes the right to not have pictures of yourself published in tabloids and not have people write porn about you on the internet.