Part of that capability includes that they not be swayed by whatever hot topic of the moment, including this. In general, I agree with the line, "if a Supreme Court justice can be bought for so little, the nation is in deeper trouble than I had imagined".
Not to say that no justice has ever done anything unquestionable. But I find that the muckraking (like the Daily Beast article quoted by another comment) only seemed to garner interest in being investigated because of the number of controversial opinions lately.[0] And people on the left were happy with the way things were as long as the Court ruled in their favor. Which is a weak position to find yourself having taken.
Any time an argument about the structure of the Court comes up, I ask, did you feel that way when it was ruling in favor of you? If not, then what kind of institution are you asking to be created? Beware.
If you thought the Court needed to be packed, would you adopt the same position if it were to be packed with conservatives? If you call for the removal of Clarence Thomas, would you be happy to have seen RBG removed for some similar questionable travel she engaged in? You want term limits on the current justices -- would you have been in favor of that for the justice that was giving you "yes" votes on cases? Or is it just because the Court's rulings aren't going your way lately?
We have far too much in society today where people want to change the rules just because the last decision didn't go their way. Democracy, I think, is actually about losing gracefully and without having a revolution, not that you always get your way.
The Court is deciding topics that are intrinsically hard to make "objectively fair" decisions about. This Court chooses to return us to previous positions that were also defensible (or saying that interpretations were incorrect) and according to certain legal principles, re-adhering to what the Constitution says to do. The Court rules on things that are intrinsically open for interpretation.
And it is a reflection of our other parts of government being dysfunctional that we for example, cannot amend the Constitution if we think that standards need to change. No court will save us on an issue where 50% of people disagree on it, no matter how strongly you may feel that your side is right. The Court is the last place that you should try to make change happen.
I am not in favor of suddenly finding / proposing all sorts of new rules just because a ruling didn't go your way.
[0] See this story for why you should read more of the detail if you wish to have a position that's more informed than "this is so corrupt": https://www.wsj.com/podcasts/opinion-potomac-watch/the-billi...