"All men are created equal" is a pretty compelling reason to end segregation. "the right of the people to keep and bear Arms, shall not be infringed" is a pretty compelling reason to end gun control. "nor shall any State deprive any person of life, liberty, or property, without due process of law" is a pretty compelling reason to require a trial to have an abortion.

You can make really good arguments from our established principles for and against most controversial issues. There is a clear method to add rights to the Constitution. I would say that happened for segregation and it took awhile to be enacted. If someone wants to change something for abortion or gun control let's amend the founding document otherwise let people live within the rules we have set.