'You may want your child to know the truth but what about when the blab to their friends. I would be seriously pissed if your kid spoilt it for for one of mine because you decided to be a Scrooge. Keep the magic alive for your child and their friends please. It’s such a magical time for kids.'
(1) Children are MORE likely, at least in my experience, to blab to their friends if they have believed in Father Christmas for several years, and then find out it's not true and feel that this is a sign of maturity: 'There's no Father Christmas; only babies think that!' I agree that parents shouldn't make a big thing about telling their children that there ISN'T a Father Christmas; but I don't think that people should feel obliged to tell them that there IS, just to prevent possible embarrassment or offence to others. It should just be treated as something that many people do and some other people (Jews, Muslims, Hindus, certain Christian sects, and just people who aren't 'into' it) don't. Live and let live! I don't think most young children are, in any case, all that preoccupied with the strict 'truth' of pretend and magic characters. They are just enjoyable (or sometimes scary).
(2) I don't think there's anything 'Scrooge-ish' about not believing in Father Christmas, so long as one is generous to others. Dickens' Scrooge was lacking in the Christmas spirit because he was stingy and selfish toward others, especially his employees, not because of anything to do with believing or not believing in Father Christmas.
I have nothing against Father Christmas, and don't think that kids who believe in him are being lied to in an immoral way, etc.; but I am worried that some posts on the thread are demanding a sort of rigid conformity to tradition over this as the ONLY right thing, in a way that would not nowadays be accepted with regard to most other traditions or customs.