Thomas has attended at least two Koch donor summits, putting him in the extraordinary position of having helped a political network that has brought multiple cases before the Supreme Court.
I still firmly believe the problem is that these justices have lifetime appointments. I understand the logic about keeping them free from political influence, but ironically I think this has gotten to the point where some of them feel invincible and thus free to insert their political biases into their judgments without fear of repercussions.
I think a better system would be for them to serve, say, 20-year terms, after which they cannot be installed in SCOTUS again. That leaves them free of political influence in the same way the Founding Fathers intended, but shortens their stay in power, which will hopefully limit the amount of damage some of them can do and perhaps make them feel less untouchable.