I remember reciting the Humpty-Dumpty rhyme for my kids. I know a lot of revisionist people think these nursery rhymes have a violent streak to them. But in this case, it's a pretty good message: break it, and you can't put it back together again.
I wonder if there's an equivalent message for non-English speaking kids. Maybe so…maybe not. But I would assume that whatever their background, people get the message somewhere along the way: at some point, you just can't say, "ooppsss…sorry about that" and pretend it never happened.
What's this got to do with anything? Simple…putting the eggshell pieces together only reminds people that you broke the egg.
If you make a promise — in business or in life — then renege on it, it doesn't matter what you do to try and make it up after the fact. The egg is done gone and broke.