The vice-president and the president of the Confederate States of America grounded their justification of American slavery on the grounds of a fraudu… - Harry V. Jaffa

DiLorenzo thinks that it is a reflection on Lincoln's anti-slavery character that he supported the Fugitive Slave Act. But the Fugitive Slave Clause is in the Constitution, and Lincoln thought that any refusal to implement the right clearly defined in the Constitution would justify secession. You can't pick and choose which parts of the Constitution you like. Once you do that, then the Constitution is simply, as Jefferson said once, "a blank sheet of paper." Jefferson said that when he was contemplating purchasing Louisiana. And having said that by purchasing it he would make the Constitution a blank sheet of paper, he went ahead and purchased Louisiana.

The idea of liberty, or the liberty which is a blessing, being an emancipation of the passions from moral restraint had no place in the constitutional doctrine of the novus ordo seclorum. The liberty which is a blessing must be good for the one who possesses it. It must therefore be a good in the sight of God, who is the source of blessings. Such a good must point to felicity, whether in this world or the next, as its consummation. By calling the advantages of liberty "blessings," the Constitution, which in certain respects makes perhaps the most radical break in all human history with all that has gone before it, nonetheless, in its understanding of the connection between happiness and virtue, aligns itself decisively with traditional moral philosophy and moral theology.

A parallel case was the Fugitive Slave Act. Article IV of the Constitution says that any person held to the service or laborer in any state escaping to another state shall not be discharged from such service or labor, but shall be returned to the one to whom the service or labor is due. This is the Fugitive Slave Clause of the Constitution.