I oppose it because if there is .0001 percent chance that the man is innocent we should not take away his life and say oops we thought he killed them people. My bad.
In the united States, this is something like the way it originally was, before the people became stupid enough to bow down to the attorneys and all the games they play.
Back then the death penalty was upheld, virtually by the whole country, but only when there was absolute proof.
If there was any doubt, the case was thrown out.
Nowadays, the attorneys and the justice system play such games that it is safer to plea bargain out, even if you are innocent.
Attorney Marc J. Victor explains:
https://www.youtube.com/watch?v=ZGdOsioCzsA.