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.

They want to perp to suffer in prison for the rest of his life.
Valid

At least I, unlike you, am not living in some fantasy world.
Invalid

Using the same logic one might conclude that the only way to prevent libel and slander is to eliminate the freedom of speech.

Invalid