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.

therefore the death penalty should not be used, simply because it kills innocent people.
Valid

No matter how well the justice system works, we will always risk convicting innocent people.
Valid

But it's easy to see that a less violent environment, incuding representations of violence, would help speeding the educating process and avoiding some bad issues.

Valid