American Slaves had better quality of life than many free African-Americans do today
Under the Plantation Slave system the slaves were guaranteed productive employment, food, and shelter. Can people in modern urban ghettos say the same? Many poor African Americans today are obese, suffer poorly managed diabetes and other chronic conditions related to morbid obesity and poor nutrition. On the plantations the slaves got plenty of exercise and ate more natural less processed foods and were healthier for it. All the horrible street drugs that cripple with addiction and kill by overdose didn't exist on the plantations.
While disobedient slaves may be punished with a whip is that really worse than being punished with homelessness and years in prison? I don't think so. A wise Master would never seriously injure his slaves as punishment because the slave was an expensive investment. Today Police, even black Police, brutalize and kill African Americans quickly and with little consequence largely because they have no wealthy, influential Master who values and protects them.
In the Plantation days children were sometimes separated from their father due to him being sold, but there was still much less fatherlessness than there is among black families today. Wise Masters taught their slaves to be obedient, God-fearing Christians and live by Christian family values. Today the rappers glorify promiscuity, wanton hedonism, street violence, and indulgence in every vice. Today many African-American Churches are just schemes to provide the preachers with money and women. Many, likes the Black Muslims and Black Israelites, also encourage radical Politics and Black separatism. Nothing good can come of this ignorance and corruption of Christ's message! Also note that the Bible never explicitly condemns slavery as an institution, it just condemns certain specific slave-owners like the Egyptians.