I learned this lesson a long time ago watching the Clarence Thomas hearings. Very early on in the hearings it became painfully obvious that the man was simply NOT qualified to become a Supreme Court Justice just based on his lack of credentials. And he's proven to be nothing but an echo chamber during his whole tenure.
When people make statements like this, I always wonder what they have accomplished in their lives to pass judgment on the qualifications of a Supreme Court Justice. My brother would always call Bush dumb and I'd say, "he has two masters degrees from Harvard and I think Yale, you barely passed high school." He was a fighter pilot and by all accounts a good one. They don't like dumb people be fighter pilots. But I guess his high school diploma and one semester of college before dropping out gives him the insight into the world the rest of us are missing.
My credentials aren't relevant. This is the internet and for all you know I have the loftiest most unassailable of achievements on my CV. Attacking me isn't relevant. What is relevant to my point is the qualifications (or lack of) of these men being given positions of extremely high power in our government being side-stepped because of the moving goal-posts of other issues.
Thomas went over 5 full years at one point without ever posing a single question to counsel in SC hearings. He has written by far the fewest majority opinions. His pen has been as quiet as his voice. He has not ever really shown the ability to influence other's to come to his opinions. Roy sees him as a 'textualist' but that begs the question of arguing over original intent. For all practical purposes, he has served as an echo chamber for the strict conservative, constructionist vote.
Even going back to his initial nomination, plenty of people questioned whether Thomas had the jurisprudential background for the job. Thomas had barely served less than a year and a half on the D.C. Circuit when he was named to take Marshall's seat. But because of (a) identity politics, as Roy points out and (b) the circus that erupted over the Anita Hill allegations, the Senate never really took to the task of actually reviewing his qualifications. They instead let his narrow escape from the scandal serve as the referendum over his nomination.