Why do people think that there Governments are oh so wonderful? Are they really guilty? Was the trial fair? Was the arrest impartial? Is the legislation justified? Was the legislation implemented correctly? I can bet you the answer to a lot of these is "no" for many individuals.
Why? Isn't life in prison enough? Do you also have to have them murdered?
No life in prison is not enough. When they decide they can rape and kill they make the choice of the rules. And too many get out and do it again. And it is not murder to kill the bastards. It is just going by their own rules. Why should they eat, drink and visit with loved ones when they alone choose to deny that to an innocent person for their own selfishness.