Despite the fact the you were a miserably old scrooge git, you really were. You know it now, and are berating yourself so pack it up and move on with this thought...

Gratification or results aren't always instant. The little girl will come to realise, that although she didn't get much instant joy returned, she actually got a huge return over time as you, after initially screwing up and thinking about it, will in future, always wave back and try to spread some joy. All because of that little girl.

Little girl did good. You repented and will do good in future.

Now stop being self-pitying and enjoy Christmas.and think about your poor old mate who's supposed to be on holiday. I'm cleaning gutters today. Yesterday I jet washed the drive, the wife's in bed with flu and my bloody mother hasn't made me a meat and tattie pie yet! Woah betide any one who tries to give me a cute wave and a smile today!

G.A.F. I. Y. Grumpy as fuck in Yorkshire ;-)