@BlueRose, I'm not on Mumsnet, so no idea what was posted there and whoever that was - but:
In general I'm with you, people should mind their own business, if someone wants to put their kid in a creche, fine, if others don't also fine. Some people have no choice, and even that isn't really anyone's business if they can't do anything about it either.
Unless there are concerns like money being tight and maybe gently suggesting that going back to work might be better long-term, I'm not sure why people keep pushing.
I'm in Germany and here, you can't win at all: Bringing your kid to nursery and you're a bad mum. If you do it so that you can work, maybe you shouldn't have had a kid in the first place. Not bringing them to nursery - well, you're having a death-clutch on your child, they'll end up socially inept and what about your career? What did you go to uni for? To stay at home?