I just read Linda Greenhouse’s article on John Roberts. My take is this: when justice Roberts was a youth, and some of his peers were wearing “question authority” pins, Roberts, were he the pin-wearing type, would have worn a “question lack of authority” pin.
He has upheld the authority of government whenever possible, and is very persnickety about questions of the standing necessary for plaintiffs to challenge its authority. He has upheld the right of people (shareholders) to authorize collectives (corporations) to speak on their behalf.
I think his reference to the duty of the court to find a law constitutional if there is any possible interpretation that doesn’t rule it out was not just a political calculation, but an expression of a strongly held principle.