The country’s founding fathers didn’t have the power to abolish slavery in their time; it would have torn the country apart. Even several decades later it still did, and we had a civil war. Those who say they were racist for not doing it are ignorant of history.
I,as a strict originalist and conservative,always struggle with this fact. Dealing with this at the convention would have saved this country from much of the mess we have now. Don't ask me how it could be done in a agricultural and pre-Industrial Revolution society. It would be nice if life begins at conception written into the Constitution also but the Founders had no concept of a mother who murders her baby but for hanging her if she did.