Because later on, if they were found to be actually innocent - the person rotting in jail can be released and compensated (to whatever extent false imprisonment can be compensated).
If they were executed, it's over. The injustice can't be remediated in any way.
Because later on, if they were found to be actually innocent - the person rotting in jail can be released and compensated (to whatever extent false imprisonment can be compensated).
If they were executed, it's over. The injustice can't be remediated in any way.