Simply put, that is human nature. Humans have their beliefs, yet don't always adhere to them. The slaveholders could also save a lot of money by not having to pay the growing number of taxes on their crops/services/slaves etc. Is it so wrong to hope for a better future, yet do nothing about it? Thomas Jefferson wrote all men are created equal. Life, Liberty and the Pursuit of happiness, remember that line? Nowhere does he mention freedom. His hope was to draw an outline for future generations.
Abraham Lincoln, who was a student of Jefferson's writings, later went on to "free" the slaves.
But still, one has to note that Jefferson set the tone for the United States' future. Filled with hypocrisy and duality, like Jefferson himself, the United States grew. And here we are. Still so at odds with our writings and beliefs. We're only human...
Every Nation was created in 1994.
VNV Nation was created in 1990.
Address to the German Nation was created in 1808.
One Nation Under was created on 2001-05-15.
It was Israel in 1948
Lincoln proposed ending slavery in the nation's capital by paying slaveholders to free their slaves.
Cuba
"Uncle Tom's Cabin" presented a strong anti-slavery message that deeply divided the nation. The book ignited tensions between abolitionists in the North and slaveholders in the South, leading to increased sectionalism and heated debates over the morality of slavery. The novel's vivid depiction of the harsh realities of slavery helped galvanize public opinion and was a catalyst for the growing abolitionist movement.
Anxious Nation was created in 1999.
VNV Nation was created in 1990.
Sinful Nation was created in 2008.
Restless Nation was created in 1991.
Guests of the Nation was created in 1931.
Dame-Nation was created in 2010.
Test the Nation was created in 2002.
The Blood of the Nation was created in 1901.
Awakening of the Nation was created in 1994.