the reason I ask is because I was whacked by one yesterday. I'm usually quite chilled out and got a lot of patience but why would people let very small children go wild with trolleys in busy supermarkets?
the mum witnessed the child hitting me and other people (one an elderly man) but continued on without apologising and letting him to it. I did say ouch loud enough to make a point. 
am I just being a grumpy sod?