We would like you to assess the QUALITY of each of the following argument (discussing Death Penalty) and determine if the argument is Valid or Invalid. A valid argument is clearly interpretable and either expresses an argument, or a premise or a conclusion that can be used in an argument for the topic of death penalty. An invalid argument is a phrase that cannot be interpreted as an argument or not on the topic of death penalty.

it has been proven time and again prisons don't rehabilitate, keeping someone in prision for their entire life in prision is less human than the death penalty.
Valid

If the justice system is organized and operated correctly, then I believe the death penalty should be used, but it should only be used in very severe cases.
Valid

Can life imprisonment for a definite yes, prevent a murderer from killing again?

Valid