You can let someone go if you found out they were innocent. This is still bad that they serviced time in prison while innocent.
However it is currently impossible to unkill someone, which makes executing someone for a crime they didn't commit significantly worse, this seems a reasonable place to draw a line to me.
However it is currently impossible to unkill someone, which makes executing someone for a crime they didn't commit significantly worse, this seems a reasonable place to draw a line to me.