"I'm just an umpire".

Umpire my ass. More like a crooked dealer of Faro in a back alley.

Sorry, Chief Justice, but you're not jjust an umpire. Someone had to call bullshit. Enter Jeffry Toobin, author of "The Nine", respected Constitutionalist and law professor had these dismaying comments about the Chief's tenure thus far

“His jurisprudence as Chief Justice, Roberts said, would be characterized by ‘modesty and humility.’ After four years on the Court, however, Roberts’s record is not that of a humble moderate but, rather, that of a doctrinaire conservative. The kind of humility that Roberts favors reflects a view that the Court should almost always defer to the existing power relationships in society. In every major case since he became the nation’s seventeenth Chief Justice, Roberts has sided with the prosecution over the defendant, the state over the condemned, the executive branch over the legislative, and the corporate defendant over the individual plaintiff.”

Despite this, Toobin misses -to me- the biggest defeat of all...the Roberts' Court striking down voluntary desegregation measures of very segregated schools, while (in an Orwellian torturing of the language) calling the decision "color blind". It's not, it wasn't and he isn't. With all due respect Chief Judge Roberts, please go fuck yourself.