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You can prevent three people from dying if you kill one yourself. This would be the morally correct choice to make
That wasn't the question. You don't have the choice to abstain. Either 1 or 3 people will die, depending on your action (including inaction).
The death penalty is wrong.
That does not prove death penalty is wrong. The question is what are the benefits in the alternatives. Let say you bring back to life 1000 convicted murderers and rapists, let even say that 100 of them are innocent, that does not mean that those other 900 won't cause catastrophic damage to society.