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.

There has seldom if ever been any occurrence in which someone has violently avenged a murderer's death.
Valid

But I oppose the death penalty because it has the capacity to kill innocent people.
Valid

One must be subject to requirements of "appropriateness" when defending against rapists and murderers forcing themselves into one's own dwelling.

Invalid