Well, the thread is entitled "Should the state help defray childcare costs?" and therefore more of a financial commentary than a social one.
With regards to the French model you mentioned, am I correct in understanding that the higher earners pay full rate of childcare and also effectively pay the taxes that subsidise the balance of the running costs of these facilities? I would wonder about high earning parents, if they have to pay full rates anyway, would they choose private over state care and as a result lead to greater class divides than we have already? There is no perfect solution and it is a highly emotive debate. Every parent wants to give the best that they can to their children and every family situation is different.