Firstly, the Supreme Court Chief Justice during that time was a major supporter of slavery, which helped the supporters immensely. Another point that the supporters of slavery had was that they viewed slaves as property instead of human beings. And the Constitution protects the rights of a citizen to their property, which meant that the supporters of slavery viewed and argued that they had the right to own slaves. The slaves themselves were viewed as property instead of humans, which was why the supporters of slavery argued that they were protected by the Constitution to own