You're just pushing the problem out one level of abstraction. Why would the utility company agree to help compel a customer? Why would an employer agree to help

You're just pushing the problem out one level of abstraction. Why would the utility company agree to help compel a customer? Why would an employer agree to help compel an employee? Ultimately because you compel them to, under similar circumstances. If businesses will generally help punish offenders amongst their customers and employees, you don't really need law enforcement. It's a tangent, but you also have to consider the self-employed survivalist on the ranch. No water to turn off, no employer to compel.