How are the lives of slaves and Northerners depicted in both Grayson and Dew's defense of slavery?

William John Grayson and Thomas R. Dew both advocated for slavery.  In both accounts, the slave ultimately benefits from his condition.  The slave is not civilized and can not provide for himself.  It is their belief that it is the task of the slave masters to provide slaves with work, food, and shelter.  Dew even goes as far as to suggest that the slaves are elated to be working in the fields.  They sing and dance while working.  In both accounts, the slave is portrayed as content with his condition because he knows that he will always have work, food, medical care, and a home.  Grayson believes that if slavery did not exist, the African-Americans would linger and refuse to find work.  He argues that the non-slave states in the north suffer from poverty and crime because they don't force their unskilled laborers to work.  Dew suggests that Southerners are the greater gentleman and that when Northerners become slave masters through marriage, they are the ones that treat the slaves with the most vitriol.  Both Grayson and Dew seem to acknowledge that there is a divine plan in play in the institution of slavery in the United States.