State of Alabama might kill an innocent man, and it doesn't care
Death row inmate Thomas Arthur might be innocent, but it does not matter to the state of Alabama. They are going to kill him anyway. His defense is willing to pay for a DNA test to prove his innocence, after his conviction 30 years ago. So, there is no cost to the state of Alabama. This test of course did not exist when he was convicted, indeed, no DNA test existed at that time.
Of course, there are many people in prisons who were convicted before there were any DNA tests. Prosecutors and attorney generals don't like to be proven wrong. They want to win re-elections and showing that they are incomptent boobs tarnishes those chances.
So, Thomas Arthur, killer or not, we won't know for sure because the state of Alabama won't let us. The Supreme Court previously denied a right to an Alaska death row inmate for the state's evidence, for post-conviction DNA testing. I guess these kinds of decisions are what the rightwing mean by combating "judicial activism". So who does this kind of thing benefit? Not the public, if an innocent man is killed because the real killer remains. All it benefits are incompetents in power.