A sense of fairness towards children hoping for a different state school allocations... but clearly no sense of fairness towards children who may end up without a state school place they need - and so bottom of the list, possibly out of area, exactly the circumstances @Hazlenuts2016 's friend finds herself in. All because their parents were pressured, bullied and shamed (with words like 'selfish', 'entitled', 'ignorant', 'reeks of privilege': all on this thread) to do something irrational. Pressured by other parents into doing something which brings little benefit to others and high potential harm to their own child.
Yes, I did read that your children are at private school. People often internalise it when constantly bombarded with hate towards a group they're part of. Doesn't make their view right.
I also saw that you're proposing 'at least turn down by the start of summer holidays'. Which isn't all that far from the few weeks before term starts I've said is probably the sweet spot.
But you're repeatedly aligning yourself with - and using the same insults as - all the posters saying 'right now', ''do it now', 'the day after offer day' (along with a comment that it was really selfish to wait until early in the holidays), 'straight away' ('Anything else is selfish'), 'reject the state offer asap'.
Ie 6 months before the new school year.
You're giving terrible advice to other parents and it's morally wrong.
Let's just hope that OP doesn't lose her job or have her DC's private school close down (like 4% of private schools did last year) in the next few months, eh?
Otherwise, she'll find herself in exactly the position @Hazlenuts2016 's friend is in - not the minor inconvenience of getting late view of their school place, but her own child not having a suitable school at all. @Hazlenuts2016 's friend didn't research school admissions properly (so nothing to do with people turning down a space later) .... but the OP actually had a place, but was pressured by people on this thread to give it up early. Same result though: no space at the best state school she could get. Not a late space: no space at all. Having to go to an out of area, unpopular school.
And if you're honest with yourself, you know as well as me that some on this thread would secretly be pleased at some 'privileged private school kid' getting 'what they deserve'. You won't be pleased - you'll be a bit sorry 'that's how things turned out' (as if you had nothing to do with it) - but you're amplifying pressure from people who absolutely will be.
Perhaps it's you who might reconsider the bad advice you're amplifying to other parents.