The way death row inmates are treated is arguably a reason to be against death row. There was also a case where a person on death row couldn’t present exculpatory evidence to prove his innocence because his last appeals lawyer didn’t do it. The Supreme Court literally decided you can prove you have evidence that proves your innocence, that you were done dirty by an incompetent lawyer, it doesn’t matter, you should still be killed.
https://en.m.wikipedia.org/wiki/Shinn_v._Ramirez