In all this discussion, let's stop and look at a slightly broader picture. Once agriculture got established most people were peasant farmers, and never traveled more than a few km away from home. They married within a small group of villages, people they knew, and the extended family was always there. Families were economic units, they worked the farm, the kids were additional labour and the means of retirement. In a sense they were married to the farm as much or more than they were married to each other. Once cropland ownership was fixed, marriages could be arranged because the lands went well together, or to end a feud. No-one was expected to be in love with their spouse (if you really liked each other that was a bonus), you loved your children and God. Love was separate from marriage, William the Conqueror was also called William the Bastard, because his mother was his father's love, but as an ordinary woman not eligible for marriage to a noble. Divorce was incredibly rare, look at the trouble Henry VIII had with getting rid of wives, it was easier to trump up treason charges and behead them. On the other hand, in many cultures a man could divorce his wife because she was barren (in reality they figure lots of marriages are childless because of him, or the 2 together, or baby after baby dies because of Rh incompatibility).
So really what we are looking at here is modern marriages, in a post-agricultural society, and the rules for life have changed. Why should we be surprised that the rules for marriage and its ending have also changed?
Re the easy marriage and divorce, what I am seeing in my DD's circle (so only a small sample, I know) is young people who are establishing themselves, figuring out themselves and their lives and relationships, and being very careful about marriage. If they are not the children of divorce themselves, they have lots of friends who are. Good birth control (and legal abortion) means that "mistakes" don't force marriage, like the girls back in my generation who "had" to get married (and most of the ones I know about ended up in unhappy marriages and divorces, they should never have married). The "married young" couples I know these days were the ones who didn't learn about birth control or had religious reasons not to use it, had sex once and got pregnant, and married. Yes, my room-mate in hospital when I had DD was one (she was less than half my age), she had just finished HS and had to delay college a year for the baby and the wedding, and of course I have no idea if she ever did go on in her education. At least their families and church were supportive.
Maybe this "easy divorce" thing is because it is super easy where some of you are? Here (Ontario, Canada) you have to have a year's legal separation before you can actually file for divorce. Ideally you go to court with a signed separation agreement, because otherwise it will be very expensive in court fees. So easier than it was, but not easy. From separation to divorce for me was over 6 years. "Easy" would have been to stay together.