I'm not condemning Sainsburys - as I said there's no reason why they would have considered how a policy like this makes 'good' kids feel.

The schools could maybe do more. My kids go to school in Streatham. They are forbidden by the school to go into any of the shops at Crown Point, which is a flashpoint for trouble as there are so many secondary schools in that area. The reasoning is kids from our school could get implicated in trouble just by being in the vicinity. So they aren't allowed there. How is this achieved? Teachers patrol the local area and trouble spots until 5pm.