But that wasn't his or SCOTUS's jobs. Their job is to rule whether or not a passed law is constitutional or not. Roberts sidestepped this obligation by clinging to an offhanded comment by Obama's lawyers that it was a tax. The problem is that even if a tax SCOTUS should have ruled on the constitutionality of that tax, and the fact that it is not applied to all citizens due to waivers. Also the idea that obamacare was a tax was not presented to the court as a reasoning for obamacare in the brief. Applying Roberts logic equally to all case before the court would render SCOTUS useless in any case brought before them concerning any law voted in by citizens or passed by legislative branches.