These debates usually descend into a pointless round of trying to add up the minutes per week spent under the same roof as your child, and whether you can impart 'more' or 'better' values to your child in x, y or z minutes
Look, surely the bottom line is that the important thing, for children and society as a whole, is to be raised well, with physical and emotional needs met, to become well adjusted successful members of society? THAT is what matters.
And that can be done in a variety of ways. You can be a brilliant WOHP or a brilliant SAHP (or conversely you can be a bad WOHP or SAHP)
If there were clear evidence that the problems in society- people turning to drink, drugs, forming poor relationships, ending up jobless, depressed, with criminal records etc- were caused because of having parents who work: then yes; there would be a very clear argument for saying that society should fund a parent to stay at home. And actually if the above were true, I'm damn sure the govt would be doing that already because it would be more cost effective than picking up the pieces of those damaged lives.
But it isn't the case. Some parents may want to stay at home, and believe it to be the best thing for their children- which is fine. But you cannot extrapolate from that a whole argument to say that it's better for society.
I have no issue with a family agreeing to one parent staying at home if it suits them. No problem. I do however have a huge problem when they try to make a generalised judgement from that and think that it's 'best' for everyone else to do so. I know that being a WOHP has worked fantastically well for our family but I wouldn't presume to tell anyone else what they should do
As a bit of an aside, tax credits were a total utter mistake. NMW should be far higher. Someone working in a NMW job should be significantly better off than someone not working. And the more hours someone works, the more they should be tangibly better off as a result. None of this fannying about being able to play the system by deliberately keeping hours to a minimum to then get topped up by tax credits. It doesn't take a huge amount of brain power to see that a system which doesn't incentivise people to work is screwed.
Personally We never benefited from any childcare subsidies, and actually even when We paid the equivalent of my income in childcare, looked on it as a long term investment and the nursery my two went to was so wonderful I saw it as money well spent but I do think childcare should be tax deductible- that would make a big difference to many people.