Killing killers may be unnecessary, but using taxpayer dollars to give them 3 square meals a day with cable television is also unnecessary. If there is, beyond any shadow of a doubt (whether by confession, multiple witnesses, or unrefutable evidence) proof that someone is a murderer and/or child molester and/or rapist by premeditated and willful execution of their actions, regardless of mental health, they should fry. I think that the conditions and terms of use for the death penalty need to be increased significantly, but consequently the time for and allowance of appeals should be reduced significantly (so as to not waste state resources).
My guess would be that 99.9% of CR members do not sponsor one of those kids in third-world countries that you can feed and medicate for $.18 a day (Benz Guy, I'm looking at you), so why would you feel comfortable paying taxes that contribute to sustaining a killer/child molester/rapist.