Absolutely. This has become such a big story because a lot of people look up to Tiger, and perhaps they are disappointed that he is just a regular person capable of making mistakes.
Just because he happens to be famous for being one of the best in his sport doesn't mean that he owes the public anything more. He has every right to keep his family life out of the public eye as much as he can. Obviously some things are beyond one person's control, but he shouldn't have to speak publicly about anything if he chooses not to.