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.

If it must be, then we shall find a way to improve these peoples habits, not kill them because they aren't 'like us'.
Valid

It should be done, but only if you are 99.9% sure that the person actually did it.
Valid

Because there's nothing to say that life imprisonment is a less harsh punishment.

Valid