I am not sure Jesus was "unjustly" executed.  The wages of sin is death.  Jesus identified with our sinful condition and thus took on himself the punishment due sin--death. That is the whole point: Jesus assumes our sinful condition and also the punishment due sin.  What happened to Jesus should have happened to all of us.   

I also don't think anyone "applauds" the idea of state executions.  Most who support the death penalty, myself included see it as a necessary evil--regrettable but necessary.  

And while you are puzzled, here is what puzzles me about liberals:  They believe that a women can murder her innocent unborn child in the name of "choice" and "freedom."  Yet they do not believe that someone who murders in cold blood--someone who is guilty of capital crimes deserves death.  So in essence they believe the innocent should die but not the guilty.  Why do liberals want to give hardened criminals all the rights but afford none to innocent unborn children?