Because they have been fooled into trading those things which are of primary importance in life (God, family, country) for that which is utterly trivial (self-gratification and comfort).
They’re told that they shouldn’t get married, never be a housewife with three kids.
Children are a burden, let’s lie about the price tag. For example, the lie that children cost a quarter million dollars to raise plus college.
Having children is a sin against suffering Mother Earth, and the world’s dying, so it is child abuse to bring a child into it. Save the world by sacrificing your fertility in the Climate Birth Strike.
Be a good loving liberal and take care of the illegal immigrants and foreign refugees we’re importing to replace you, the poor babies.
Go be a pet parent, they’ll love you, and you can take care of them. It is a replacement for children. And we hate your kind and want you to NOT have children, so we’ll say the only way you can have it all - a partner, career, social live, activism - is never to have children.