Came for shopping with my case as I was flying on ...

Came for shopping with my case as I was flying on that day.Even westfield have service where you can leave your bag and go shopping easily.I was trying to ask the staff what I can do in this situation and all of them (especially girl at reception )were very rood to me.They said that I have to care it with me whole time due to current situation in London !!!!But is it not silly ??!?!?!if you care about your customers you should check their bags on entrance or put a mettalodetector !Not to treat them like that