Upon reading some of the lyrics above, I gather that "hypocrites," "no unholy," and like terms could apply to slaveholders, overseers, or other oppressive or exploitative persons. I don't know the dates of those lyrics, but terms denoting or connoting hypocrisy and unholiness go way back. Although the proud high and mighty have not tended to think of themselves as hypocritical or unholy, and might not recognize themselves in song, perhaps there was some solace for those singers who knew whom they were singing about.