Ideally, the world and everyone in it would be perfect. The ideal won't happen until we're in heaven.
"For in the resurrection they neither marry, nor are given in marriage, but are as the angels of God in heaven. "
The marriage mandates weren't for heaven, they were for now. I know that people aren't perfect. That's why we need grace through the perfect One Who was sacrificed in our place for our sins.
When proper choices are made for marriage, family, salvation, etc , folks are much happier in general. God is able to bless those families, churches and communities. When the sons of God (saved) marry the fair daughters of (unregenerate) men, there's no end to the complications, the misery resulting from those sins. There are cycles of endless examples in the Old Testament warning us about this. I'm not down on those who are divorced, or who decided to commit adultery. I am recognizing it as a plague upon America. It's probably the same elsewhere too. It's hard to find anyone qualified for marriage thanks to the parents disregarding the instructions in the Bible.