instruction:
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.
question:
And in an atheist's perspective, from our own morals, we should know that causing another death of a human being is highly unnecessary, considering that we all ready have them behind bars.
answer:
Valid


question:
Firstly, many people say that Europe does not have the death penalty so the U.S should not.
answer:
Valid


question:
...and if I do someday murder someone, I should be killed.
answer:

Valid