It would be if the dissenting opinion written by Justice Scalia in a case before the US Supreme Court had any authority. Here is what he wrote:
This court has never held that the Constitution forbids the execution of a convicted defendant who had a full and fair trial but is later able to convince a habeas court that he is 'actually' innocent.
A leader in the New York Times has some apt words about that.
For the state to put a person to death is, in our opinion, always wrong. To do so in the face of clear evidence of innocence is barbaric.
See also the view of Alan Dershowitz. Is there an offence known as bringing the Supreme Court into disrepute?