The fact that Lance and Melinda were engaged, then married and subsequently divorced are matters of public record. The reasons why they were divorced, the angst, the issues, and the conflicts, if any, are not.
Tsunamee5, if I understand correctly, takes the position that when a person achieves celebrity status their right to privacy (or at least public conjecture about private affairs) is forfeit. My first feeling is that this is a difficult position to defend, but not one that's hard to understand. In recent decades we've seen media pry and pry and pry in the interest of a public's "right to know" until it seems that celebrities must battle for any privacy at all. A question is, would we continue that precedent? Just because "that's the way it is," does that mean that's the path we're going to continue?
It seems obvious that such prying into, say, Lance Burton's, Melinda's, or anyone else's life not only doesn't benefit them, it doesn't benefit us to do so. I look back over my entire life and try to count the number of times that such gossip has garnered any good at all of any kind. So far, I can't think of a single one. There seem to be plenty of examples, though, where it's caused a great deal of harm.
Simply because someone is well known doesn't justify making them a target for our somewhat perverse curiosity -- nor does it make them somehow lesser than we are, less deserving of the same respect, same regard, and the same treatment as anyone else. In fact, in the case of the greatly talented, I'd think it would make them more deserving of our regard and the treatment to match. So, we enjoy the shining brilliance that they share with us and leave the rest alone.