> invest your full time into raising and educating your own children - probably the most rational choice, with the least value to the rest of society.

That seems like a strange way to describe preparing the next generation. :D

Don't most people consider raising and educating their children to be one of the most valuable things to be done for society? eg having more knowledgeable/skilled/clueful young is better "for everyone" (as a generalisation) than not