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're more to help the guards than the prisoners.
Invalid

Until then, I remain unmoved by their cries of "innocent people" being put to death.
Valid

I'd think murders going down after any execution would be mostly coincidental as most are 'heat of the moment' without consideration for penalty.

Valid