Every discussion of Sowell online seems to attract fans of his declaring how brilliant he is. It's a bit strange the sort of hero worship he attracts. Personally, I've never seen it; while he seems like a reasonably smart person, his ideas are simply a mix of standard conservatism and condemnation of the intellectual establishment as he sees it. His views on immigration are uninspiring, the reasons he believes the U.S. is declining are unconvincing to me, and he vocally refuses to believe that climate change in an issue (in my opinion mostly because he is ideologically opposed to proposals to fight climate change).
I think part of the reason a lot of conservatives love him is that his haughty and confident attitude, especially when speaking about other intellectuals, is quite seductive. It's convenient and attractive to think that many of the worlds problems are because of people (mostly liberals) who think they are smarter than they are.