It simply doesn't matter how the president was elected. Every single Justice was appointed by a duly elected president, and whether he won the popular vote or not is irrelevant. And as I said, the "will of the people" is irrelevant to the job the Justices are supposed to do. They are supposed to directly counter that "will" if it is not Constitutional.That is true for any justice's vote and ruling. But here is the point you are not grasping, a 6/3 conservative court is a court whose collective judicial philosophy is not according to the will of the people. Proof of that fact is that if the majority had elected the president in 2016, representing the will of the people, the court would not be 6/3 conservative, it would be 5/4 liberal, with probably a moderate, Merrick Garland, as the swing vote (or it would be 6/3 liberal then you'd be making the same argument I'm making). But a 5/4 court with a swing vote, That would best reflect the will of the people.
Do not pettifog on how they rule individually.