Sure, but a lot of those people would have been married to each other in our previous, more restrictive, era.
There's a lot of self-selection going on now, as people who are married now tend to be more stable and family oriented, as that's why they made the choice to be married. The act of marriage, in and of itself, doesn't make people more stable and family-oriented. (See the OP for an example!)
I wouldn't necessarily agree with the first point, as while the divorce rate has been going down, it's still between 40% and 50%. Marriage should always be carefully considered. I think this is why, in times past, a girl's parents had more say in who she married. it wasn't because the parents, usually the father, wanted something out of it, it was because they didn't trust a teenager to know who would be able to take care of her, and they wanted to make sure she was with someone who would treat her right. Sure, you had the fathers who married their daughters off for their own gain, but that wasn't the reason for the practice and outside royalty or politics, wasn't usually done.
As for the second point, that's true, but again marriage needs to be a choice that was well thought out and considered for all the ramifications. You are binding yourself to another person, at least legally if you don't believe spiritually. That shouldn't be something you just end because you can't get along. If you're not willing to change and adapt to this other person, or the thought of "well, i could just divorce them if I don't like them in ten years" is crossing your mind as you're saying your vows, then maybe marriage isn't for you, at least not at this time. You should know who you're marrying, and divorce should be reserved for true cases of abuse or neglect. (I don't believe anyone, male or female, should ever stay in an abusive relationship, just for clarification).
My main point was that the view of sex has changed from something sacred, to something cheap and easy. Young people want to get rid of their virginity as soon as possible, and feel shamed for keeping it into their twenties or thirties if they don't find a suitable mate. That shouldn't be the case. A person shouldn't feel ashamed because they refused to hurry up and get laid and instead decided to be responsible and wait until they were married. Before, it was assumed you would be a virgin on your wedding night, and if you weren't, you kept it quiet. Now, there's actual pressure to make sure you're NOT a virgin on your wedding night. Enter teen pregnancies. Enter STD's.
In fact, I was recently informed by a high school teacher that his female students have told him that boys don't ask girls out on dates anymore. There is no dating. The boys simply say "Hey, you wanna be my girlfriend?" If they say yes, their next sentence is "Let's go hook up."
There's no romance. There's no courting. It's straight to sex. Many young girls have had sex before they even have their first kiss. And these boys know if they ask around often enough, they'll land a hit, because the girls are feeling that peer pressure to do what their peers are doing. While high school has always had horny teenagers, it has never been this rampant and open. That is a shift in cultural morals, and a fairly recent one, and it scares me to death for my daughter. But it is the logical continence of the sexual revolution and of telling our high schoolers to just "Make sure you use protection."
I'm not saying we should make adultery a criminal offence, necessarily, although if you're married you are going into a legal contract, making legal vows before the state, and then breaking that contract. All I'm saying is that sex needs to be given the respect it deserves, and not be cheapened by simply saying "Who cares what they do in their personal time." I care, because it is a sign of how far society has crumbled, and will continue to crumble if that sort of behavior continues to be normalized. Currently we have laws against some of these things, especially when it pertains to minors, but eventually those laws will be changed if the current direction is sustained. We already have people petitioning to get pedophilia added as simply another form of sexual preference that is a personal choice and has nothing to do with anyone but those consenting. Right now that seems abhorrent, but in twenty years, if we don't make an effort to change directions, then legally it won't be.