A divorce is nothing more than one or both people coming to the realization that their marriage was a mistake. I honestly believe the number one cause for divorce is and has always been selecting the wrong mate.
We often get into relationships and marry people for numerous reasons. Sometimes we have yet to figure out what it is we truly want and need in a life partner, Or what worked for us at one time no longer suits us and our mate is happy with the way things are. Other times one or both people (changes) dramatically over the years from what caused them to fall in love. A mate may commit a "deal breaker" which destroys the foundation of the marriage.
There is no amount of "communication" or "work" that can overcome being with someone who does not want what you want." Relationships don't come down to "right" or "wrong" but rather "agree" or "disagree". Ultimately we are looking for someone who (naturally agrees) with us on the major things in life.
Lastly I believe having more "options" especially financial means tends to cause us to put up with less "crap" or stops us from going with the flow because we fear our living standard will drop signifcantly. Two world famous multi-millionaire celebrities are not likely to stay together if they are "unhappy". They are both rich and they know there are millions of people who would love to date or marry them.
Having "options" effects everything we do in life. Imagine having a job where your boss rides you everyday and at the same time (you know) if you quit there are 100s of companies that would hire you in a heartbeat! How long would you stay and try to (work) things out? Continue to try to get your boss to change? or Attempt to change yourself?
There is a large segment of the general public who become "emotionally invested" in the lives of celebrities. Many of these people live their lives (vicariously) through them. When they learn of a divorce or any other hardship a celebrity has to deal with they feel as though their best friend or a family memember is going through a hard time and it upsets them.