The divorce rate has skyrocketed as the average human lifespan has doubled... coincidence?
I grew up surrounded by frothing at the mouth Catholics, and in spite of my boundless hate for religion, I think there is something to marriage. To get married is to say "I love you and I don't believe I'll be able to love anyone more than you ever." Now, few people can see how they'll feel in fifty years, but that statement definitely holds some weight with many people. Therefore if two people love each other and want to make that statement, who are we to stop them?