TASK DEFINITION: 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.
PROBLEM: Life incarceration will never let him kill again, and its cheaper.

SOLUTION: Valid

PROBLEM: But if that one doesn't wash for you, here's another argument against the deterent factor (and I must credit a bunch of wonderful schools debaters from a disadvantaged community in the third world for this):

SOLUTION: Valid

PROBLEM: If there was only one flavor of "pro-life", then every one of them would have to be a pacifist and never engage in any war.

SOLUTION:
Invalid