Earlier quoted context omitted.
You're right that it's not the case that "someone else" pays the whole bill. But why should they? It's a personal choice to have children, and it's impossible to be a parent X hours a day and also spend those same X hours "in the lab". Just like it's not possible to spend all your time in the lab and also be a (present) parent. The limited time for everything that can be done in a lifetime is not about "fairness", an…
Because you need those children to grow up and: - pay taxes - make good governance choices - buy the products you may be making - make the products you might be selling - make the products you consume the list goes on...
But this is the most subsidized one of all (even in the US), and people do it whether it's subsidized or not.
You could say that they are getting "paid in love".
If it's already worth it for them, why should they be paid twice?
Most of the benefits you list may be better off with fewer kids with the same government support.
I definitely think we should invest in schools and such, to make the best people we can. But I'm sick of parents complaining that children affects their economy or has opportunity cost.
Parents don't deserve a handout. Children do, however, deserve a good education.
Literally everything in in life has opportunity cost. Nobody owes removing that cost for anyone else.
If you spend all your money on partying nobody owes you the cost of nice clothes.