This is very worrying. All my JW family are constantly showing pics of themselves standing by the carts in all sorts of locations, from train stations to public parks, always where there are loads of people.
The weather in the UK is very blustery at the moment and if trees can be uprooted and injure people then so can carts! Not to mention people rushing about not looking where they are going. I will try to tactfully alert my family to the dangers of being unprotected but I won't hold my breath .