Probably because the Revolution was akin to a child leaving home to make its way in the world, but the Civil War was a full blown crisis of conscience. It put two of our most cherished principles in direct conflict with each other - the rights of property, where no one can simply come and take what is yours against your will and without due recompense; and a belief in freedom, that all men are created equal and endowed by their Creator with certain inalienable rights, among these liberty and the pursuit of happiness.