Oh I totally agree we do. I came very close to striking DS lay week and ended up pelting his dummy across the room very hard (in the opposite direction). It scared the bejesus out of both us. I really do get that there could have been 100 (or 2 or 5) things that led to that moment in woolies.
But part of the reason that I felt/feel so awful is because it was a chain of events started by me, which is why I started this thread.
Also, to clarify cos I realise I didn't write it properly, the mother didn't slap her daughter actually in the face - it was more like she slapped her on the arm then held on and shook her for a second. Still unpleasant but nothing a like a slap in the face. I would have made a report if that had occurred.