I don't like marriage, as an institution. I'm married, because I'm quite certain that I want to stay with this person, because of tax benefits and a clearly defined situation for offsprings (from 'parental rights' to banal things like 'last name of the little one').
Without that, I couldn't care less about marriage (yes, my wife knows that pov). I'm not religious, so all the reasons for marriage listed there don't apply. Looking at society I think that - depending on the country/region/culture, I guess - marriage lost its meaning.
You might disagree and think that marriage is still an important concept, but in that case I'd argue that divorce shouldn't be ~that easy~. That doesn't mix in my world. The _only_ value of marriage, subjective of course, is the binding vow to stay with someone, period. Reducing that to "Yeah, 'til death or .. something else" is really nonsense, in absolute terms.
I love my wife, but my signature & vow aren't better than a vow I presented her on a random beach in France, with no witnesses.
Ignoring my impression of the value of marriage: Lots of people around me (and my former self certainly as well) seem to be less tolerant. If it's more and more easy to find a new partner (the original article mentions finding people on craigslist..), why would you invest time and energy in this current relationship, that goes through a hard time? The incentive is lowered: You can find people easily (online, offline), society doesn't really care if you were married before in general (certainly not everywhere, but in the western countries I know that's the case) and getting a divorce is ~easy~ (although, potentially nasty/expensive/etc). Why should you work hard to overcome problems in a relationship where a lot of the initial giddy feeling stuff is gone (substituted with something just as good perhaps, if you're happy. But .. in times of crisis you'll probably forget about that)?
Let's get back to the question, shall we? In a word, in my expectation, the reason for a high rate of divorce is:
Lazyness
