What was Lncoln referring to when he spoke of pernicious abstraction?

Pernicious Abstraction is a phrase coined by Abraham Lincoln in his critique of the Dred Scott v. Sandford Supreme Court case. In the case, the court ruled that enslaved people were not citizens of the United States and could not sue in federal court. Lincoln viewed this ruling as an example of "pernicious abstraction," or the practice of taking a complex legal issue and reducing it to a simple abstract principle. He argued that this approach ignored the real-world consequences of the decision, particularly for enslaved people and their supporters.