We would like you to assess the QUALITY of each of the following argument (discussing Gun Control) 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 gun control. An invalid argument is a phrase that cannot be interpreted as an argument or not on the topic of gun control.

Gun ownership is a recognized, constitutionally protected right, and it's not dependent on fulfilling some duty to the city, state or federal government.
Valid

The difference is the fact that at the time firearms were not prohibited on school grounds which lead to return fire coming from regular citizens and students in aid of the police on the scene.
Valid

As a comparison on how much effect that an Assault Weapons ban would have on crime, even if they confiscated them all.

Valid