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.

Still, in some cases death penalty would be the right thing to do (no point keeping mentally insane murderers just locked up for their whole life, although there could be some ways to use them).
Valid

The judge may or may not feel the death penaly is warranted.
Valid

That would be very cost-efficient, but it would collide with our interests in legal justice.

Invalid