disclaimer – I am 100% against* the death penalty
Right then, the ‘you just want vengeance’ argument has a flaw…
If you wanted proper actual vengeance, you wouldn’t want to execute them, you want to torture them, make the suffer, and make them pay, you’d want it to be slow and agonising, simply killing them doesn’t do much of that, and after it’s happened they’re not going to care anyway so there’d not even be the satisfaction of remorse.
The only even slightly valid justification I can think of for the death penalty is one of protection, protection of the public, and that can be achieved with incarceration and/or rehabilitation, so that argument doesn’t hold much weight with me either.
* there are just too many complex reasons why, wrongful conviction, mental illness, situational pressures etc. are just some of them that mean it’s simply not a sound act, even if you did believe that killing is an OK response to killing.
Even if Tommy McEvil walked committed a horrible murder, was witnessed by 100 people, walked into the police station admitted everything and said “I just like to kill people” I would still be against the death penalty, as Tommy McEvil would clearly have a brain that for some reason (nature or nurture) is simply not like the rest of us…