I don't agree with hitting (anyone).
I don't agree with parents not correcting/disciplining their children.
The shopworker certainly should not have laid hands on a child (unless they were in danger if hurting themselves/someone else).
I feel sorry she lost her job (in this climate, I feel sorry for anyone having to find a job).
I hate the whole 'I shall speak to the press, have a sad-pony-face photo taken, then possible sue' culture we now have.
If I had been that child, my mum would have most likely told off the assistant, yelled at me, then dragged me home and given me what-for for being such a pain in the backside that someone was driven to feeling the need to whallop me.
If it was my son, I'd be angry because I don't agree with hitting, annoyed with myself if his behaviour had been that disruptive, but I wouldn't be asking for the cashiers head on a plate or threaten to hit her. What is the right retribution - sacking, jail, hanging, flogging, branding, eternal damnation...?