Reading the opinions, it is a breath of fresh air to see one of the branches of government relying upon fact and logical argument when discussing the issues. This is how America is supposed to work.
The problem is that when it comes to the really sticky, complex issues that affect huge swaths of human rights, it's very possible for justices, in your words, to "rely upon fact and logical argument," but base their end goal/optimization function on either "what did the founders of the country factually and logically intend" or "what do the norms and ideals of modern society suggest would be factually and logically sustainable" without regard to the opposite viewpoint.
A real balance between these viewpoints keeps the pendulum from swinging out of control; it serves as a low-pass filter on the often-wild steering of policy, or the whims of a short-term-focused electorate. But it's equally important that the ultimate power reside long-term with the people. And one very possible outcome is that our justices succumb simultaneously to a pandemic, during an administration that, to be as charitable as possible, does not seem particularly concerned with nuance, system stability, or universal enfranchisement. And it's a lot to ask of a justice to hold both the meta-meta-viewpoint and legal precision in mind, especially as it seems likely that constitutional questions will be in play as November approaches. All we can do is hope they will rise to the occasion.