We have long operated this way. Banks have security guards even though there are laws against theft. Greengrocers often have fresh fruit outside with no way t

We have long operated this way. Banks have security guards even though there are laws against theft. Greengrocers often have fresh fruit outside with no way to stop people from grabbing some and running off. It's simply the way of the world. I don't believe it's change materially, except to the degree that the ability to self defend (e.g. better locks) and to identify miscreants (e.g. cameras) has improved. I do feel that there are more private security guards than there used to be but when I watch old movies I'm not sure my impression is correct.