I don’t think you’ve actually read any of Sowell’s work and I doubt you know Vosburg. He’s a sociology PHD candidate at Ohio State focusing on Religion and Socialism.
Sowell has a degree in Economics from Harvard and a Masters from Columbia University. He has been the Senior Fellow at Stanford University since 1980. He turned down the position of US Secretary of Education and also as head of the Federal Trade Commission. What I am saying is you could not have cited someone less qualified to critique Sowell’s work.