Supermarket shopping trolleys

Is anyone else bemused that the shops that own these stupid shopping trolleys don't put a doorkeeper on the exits to their shops to stop people removing the things?

They appear everywhere on the streets and seem to be so solidly constructed that they will outlast civilisation itself.  The owners (the shops) are so lazy they don't even look for them anymore.  Annoyed citizens have to log on to a website to report the things.  Any shop owner should be able to track the migratory patterns of their trolleys, and go out and pick them up.  That's if they really can't put someone on their door - they seem to have 12 staff supervising the 'self check out' area so there must be someone spare.

I recall when - wait for it - 'Rebel Sport' had an armed guard standing outside the shop.  I was never sure if this was to shoot armed robbers or shoplifters.  Presumably shoplifters, if they were moving slowly enough. An actual armed robber would have disarmed the guard in seconds.  So, instead of an armed guard, what about a trolley attendant?  Of course it's all too hard for the troglodytes in charge of these places...