God gave humans free choice. That means as a human being you are free to choose to murder someone. Nowhere in the Bible does it say that we should murder people and nowhere in our constitution does it protect that right. And that is a good thing. It also doesn’t protect the right to Rob or steal or rape or any of those other things. Those are all things that God has given each individual the right to choose to do or not do. And that choice will have ramifications.
I think you are confusing ability with right.