“Carson has no background in law.”
The same could be said about Sotomayo and and Ketanji Jackson. (Kagan is a lib, but she at least knows the law; whether she applies it correctly, is a separate question. Same for Roberts.)
BTW, both Thomas and Alito are younger than DJT. DJT seems to get around OK.
They have formal training and received degrees from respected law schools - however compromised they might be by their politics.
I think some background in law is essential in a modern SC justice.