I dont have much personal experience but it's something I researched a while ago. My nephew threw a tanty in Target, embarassing my SIL. My brother took him out of the store for a while, then brought him back to apologise to me and SIL. I asked him what he was sorry for and he tearfully protested 'I dont know!'. He was 4 at the time and we wanted a Batman figurine. It interested me from a child psychology perspective. Anyway, research shows that at that age, a forced apology doesnt change behaviour from unacceptable to acceptable. They dont have the capacity to feel sorry if they aren't.
Here's a link to a blog entry:
http://www.janetlansbury.com/2009/12/youll-be-sorry/
I also found research on it but the site had commercial links so I cant post. If you google "child development apology", there's some interesting reading.
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