One forfeits the right to life, in a just society like we have, the society does not deprive one of the right to life.You know, it is possible to look at it another way.
If it is true that only God can give and take away rights, how is it possible for man(in a more specific case, the judicial system) to condemn another man to death--i.e. deprive him of his right to life?
Makes you wonder, what the hell are "rights" anyway. That is if you are honestly asking the question in the philosophical sense.
See--no one can just stop at that question. We need something substantial to talk about.
The issue of "Do we surrender our rights when we commit a crime?" is a much more substantial topic than just "Do we have the right to life?"
Yes, that is the argument from a Judicial sense. But note how that runs up against "Only God can give or take away rights." By surrendering them, you did something that only God can do.