Earlier quoted context omitted.
Maybe people don't want to bring children into a world that will be worse off in many ways than the one they grew up in? That hypothesis would correspond with the observation that it's the most educated, most long-term-focused people in (currently) stable societies that are delaying or avoiding children.
"Maybe people don't want to bring children into a world that will be worse off in many ways than the one they grew up in?" Objective measurements show that the world better off than it was and still improving. [0] [0] https://www.youtube.com/watch?v=yCm9Ng0bbEQ
For the US middle-class? Medical expenses and college tuition are both exploding, so they are finding it increasingly hard to make ends meet. Yes cars are safer, cellphones so much better and so on, but it just doesn't add up to enough.
Plus all it takes is one wrong move by Putin or Kimmy and all that progress goes up in a mushroom cloud.