Childless people are getting the best deal of anyone. They get new social security payers with a better invested upbringing, all for paying out a pittance and offloading most of the cost onto parents -- all the meanwhile having their social security payout almost completely untied to making the investments needed to get their payment.
Childless people basically get their cake and eat it too under the social welfare scheme of most western countries, getting the benefits of children without having to deal with much of the drawbacks.