The Congressional Budget Office says 15 million people will lose medical coverage next year if the Senate GOP’s health-care bill becomes law. That’s not quite accurate. CBO doesn’t believe that millions will “lose” their insurance in 2018. Instead, the agency thinks that millions will happily cancel their coverage—even those who get it for free. The reason: The Senate bill would repeal the Obamacare tax penalty on the uninsured, known as the individual mandate. If CBO is to be believed, 15 million people didn’t want health coverage in the first place. They enrolled only to keep the IRS off their backs.

. . .