Or to paraphrase that Your Cable Company commercial, see, our service is what is called an oligopoly which is the same as a monopoly, but perfectly legal.

Now just to clarify, because a lot of people are endorsing violence: Violence will not bring justice. Nor will it resolve your specific grievance.

What violence will do (provided there's enough of it) is force the society to create a system that does solve grievances for which people turn to violence.

So you can't kill one CEO and expect change. But if you kill hundreds of health insurance upper management (yes, there's a lot of them), or if you burn down dozens of insurance company offices, or find a way to cost the insurance companies billions of dollars, then the state will have to do something about it, and that's after it overwhelms law enforcement.