It appears that, even in Texas, unsafe convictions can sometimes be reviewed.
It is not certain that Rodney Reed is innocent, but it is highly likely. There were reasons enough at his trial for finding him innocent, but "expert" testimony (which those who gave it now admit was incorrect) gave the all-white jury enough of an excuse to convict. There was pretty much no other evidence against Reed.
There was a much more logical suspect at the time, but he was white, and a police officer.
If authorities wish to reserve the right to kill in cold blood, at least they have a duty to ensure that they kill the wrong people as rarely as possible. It is bad enough when people are locked up for decades for crimes they did not commit, but at least there is an opportunity for partial restitution. Snuffing out the life of an innocent man is something that should horrify anyone with a sense of justice.