Headline at Next Big Future:

Private police and security outnumber public police by five times and private security industry is $35 billion per year.

To extend the inflection metaphor — e.g. anticipating the kinds of jobs that won’t exist in the future? Artificial Intelligence entities will operate in the physical security space (patrols, monitoring and the like) very soon. Again it’s the issue of repeatable, consistent, measurable results that matters. The application of A.I. systems to “Intruder detection” will be wide spread (physical and cybernetic.)

http://www.nextbigfuture.com/2016/09/private-police-and-security-outnumber.html?m=1

Simply put it’s economics. If $35B per year can be re-allocated so that a large slice of the human resource expense picture is re-apportioned to capitalize investments in unsalaried / uninsured / retirement-less artificial resources? Profits will go up.