This is downpayment for the future taxes by their children. Seems fair to me. But, for some reason, not for you?
If you begin to optimize social and political decisions on the basis of having more tax payers, you'll get weird results. For a second example, cutting reproductive education funding in schools will lead to more tax payers (though arguably tax payers who pay less, so then the question becomes are you optimizing for tax payers or for future taxable income in total).
Do you have a citation for this? One with "cutting funding" in it and not the generic comparison between Somalia and Germany.
Your primary fallacy here is that you think you can always "mince the meat back". You usually can't. It doesn't work that way.