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: I am glad that you, and now gman, admit that vengeance is the underlying influence.

SOLUTION: Valid

PROBLEM: Getting rid of the death penalty would ultimately not be more cost effective.

SOLUTION: Valid

PROBLEM: But if Capital punishment is used, it has to be used in all situations according to the precedent set, i.e. if the next person did not kill anyone and is wrongly convicted, he too must be executed.

SOLUTION:
Valid