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]: In reality, prison population is a zero sum game because nobody wants a new prison in their back yard (NIMBY principle).
[EX A]: Valid

[EX Q]: I have a friend who would not balk at 99%.
[EX A]: Invalid

[EX Q]: Although in practice it would be counter-productive and in a sense be unfair to all those you just listed (except possibly the victim, he's dead anyway)
[EX A]:
Invalid