Actually it is one of the cops’ jobs, actually usually the sheriff’s, to be there if requested when a landlord retakes possession of property from a deadbeat tenant. One of their oldest duties in fact under common law. Why? To prevent breaches of the peace.
My, my are you obtuse. It's simply not the responsibility of the cops to hold a landlord's hand. That's why they all have a friend or two around to bust door locks off with hammers.