Just an aside, In Virginia's capitol of Williamsburg about 50% of the residents were African American. 50% of those were slaves. There were a number of free blacks.
If we were taught the truth in schools, the thinking on this might change a bit. In states like Virginia, North and South Carolina the economy was largely agrarian. Negros had been imported to primarily work the fields, but also many worked in homes. By the time the Revolution came around the system was imbedded in the regions economy. Also by then laws, mostly set up by the colonies legislatures and approved by the English governing body made it nearly impossible to free the slaves without bankrupting the regions economy. It was one of those impossible conundrums.
Yes the Washington's, Jefferson's Madison's and such were hypocrites and racists. It took the Civil War to begin to change things.
BTW, I'm not defending it. Just telling the truth.