So let me get this straight. The State of Texas is evil, but your friend is good? Tell me, my naive friend, what color is the sun in your world?
The state has absolute authority to execute this man, the "world court" that you reference, has no authority. Your friend gave up his rights, other than his legal rights, when he committed such a heinous crime. You would do your friend a greater 0service if you recognized his failings as a human, and used that knowledge to change your perspective and help others. However, I am afraid that you will go through life feeling victimized yourself, blaming others for your and your friend's problems, taking from society rather than contributing in a meaningful way. But do not beat yourself up too much. There are far too many of us willing to carry on, contributing so that others do not have to.