I just did a little reading up on Dr. Thomas Sowell, he has quite an impressive background with more than his share of adversity. Until someone can prove otherwise I'd say he has a lot more credibiiity than his detractors, but as always I'm ready to be proven wrong.
I looked him up briefly, and he is a conservative through and through. He belongs to the right wing of the Republican Party; he is part of the Republican Party base. He considers himself to be a Libertarian, but he supports banning abortion. So he is just another conservative masquerading as a libertarian.
His views are probably close to what you believe, so you may find his writings appealing. As for me, he is a right winger, a partisan political hack, and so not reliable. I wouldn’t believe anything Dr. Sewell says.