Is your contention that they would not have these problems if they'd had a kid 
No. The starting point is finding a lifelong partner. It’s called family planning for a reason.
My experience is this. Being a husband and father is a completely different life than being single/dating.
Your state of mind and decision making has nothing in common with a single 22yr old. I have responsibility for 2 other lives, a single 22yr old only worries about themselves. A pet dog is not the same as a child.
In today’s market 99.9% of single people can’t afford a property with their lifestyle. They instead focus on self gratification which results in delaying finding a partner and settling down.
Age of marriage is getting older. Birth rates have plummeted. Property ownership in young people has plummeted.