The fact that each company would have to redundantly set up their own.<p>The fact that the concept of private jurisdiction is currently incompatible with US Values.<p>And finally, the fact that its a classic &quot;Tragedy of the Commons&quot; situation. Of course, you don&#x27;t believe in that so what can I say? If one company&#x27;s police force is effective, no other company will fund the police force. (At which point, the first company&#x27;s police force will lose funding because why should only one company pay for the benefits of everyone else?)<p>Now assuming each company&#x27;s private police force gets their own jurisdiction, then all you gotta do to commit a theft is to leave the jurisdiction of police forces. Just like what criminals did before the FBI was invented in the 1920s. Committed a crime in New York? Move to Florida, then commit another crime.<p>A system of a large-scale, cross-jurisdiction police force needs to be created to adequately solve the problem. (Ex: True, New York&#x27;s NYPD will stop following you around, but the FBI will be on your tail).<p>And then we go back to the problem of the big &quot;one jurisdiction police force&quot;, who pays for it?<p>Market failure. No one wants to pay for it, because everybody would rather be a freeloader. Because being a freeloader is the good and proper greedy way of getting things done.<p>Solution? Tax everybody, then use taxes to pay for the big cross-jurisdiction police force. This gives the opportunity for little police forces (and private security measures) to do their thing in the small scale.