The inflation argument is a little misleading. We have been printing money to offset historically low and increasingly declining money velocity. The money velocity is declining precisely because wealth is being aggregated in silos and not being spent. Money velocity is essential to a healthy economy. And quite frankly, we could do with a little inflation to encourage spending and not hoarding by the uber wealthy.
Thinking that properly raising children and investing in bettering oneself doesn't tangibly generate revenue is a bit short sighted.
In 15 years when machines are cheaper and better at driving, manufacturing, and doing most unskilled labor (or even some knowledge worker type jobs). Would it have been a bad economic investment to have all the kids growing up today have parents with the financial freedom to go back to school or focus on giving their kids a proper childhood (so they can grow up and be productive citizens)?
Do you genuinely think that we are better off as a society sticking to "you have to work to live" when the machines are outperforming an entire class of people at their jobs? Not everyone can or wants to be an engineer. At some point our populations will stabilize, and technology will make it so that we have enough food and basic essentials for everyone.
We are all in it together.