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.

[EX Q]: After we get through that, if he still retains the death penalty, it's a lot cheaper to kill him than to keep him up 'til he dies in prison.
[EX A]: Valid

[EX Q]: IMHO, if we have the confidence in our system to throw someone in a cage for the rest of their natural life we should have the same confidence to put someone to death.
[EX A]: Valid

[EX Q]: In some communities (especially in the third world) vigil-anti justice is very common.
[EX A]:
Valid