Many critics of the U.S. health care system claim the tragic murder of UnitedHealthcare CEO Brian Thompson is understandable because health insurance companies occasionally refuse to cover certain medical treatments. And they often assert that if the country were to embrace a U.K. or Canadian-style government-run health care system, no one would be denied care. Those critics are either misinformed or intentionally trying to deceive the public, because government-run health care systems ...