I can't think who it wouldn't benefit.
A good nursery or childminder that was provided for by the state - as schools are - would enable parents who want to work to do so meaning there wasn't a reliance on benefits for single parents and they'd then be paying tax.
Some children would benefit greatly - I mean children who perhaps don't come from orderly homes.
I'm not saying everyone would have to send their child but if the option was there! wouldn't it make a difference to many people?