It is simple. This world as it stands has no future, and is too stressful. It is incompatible with happy women. Unhappy women destroy this world. Not with war, but with apathy. Take away the passion to exist in women, and the planet dies.
Consistently taking away women rights, belittling them, ignoring their complaints, and making everyday life a needlessly complicated rat's nest of intricate nonsense tends to kill any desire to procreate.
Make a world worth living in, that is safe, fun, prosperous, and happy, then people will have kids again.
No one cares about your retirement. They also don't care about their own retirement. They sure as shit aren't having kids for their own retirement plans. It would be extreme narcissistic selfishness to have kids as a retirement plan, I can't imagine anyone in the real world thinking that way.