instruction:
We would like you to assess the QUALITY of each of the following argument (discussing Gay Marriage) 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 gay marriage. An invalid argument is a phrase that cannot be interpreted as an argument or not on the topic of gay marriage.
question:
It can't be proven that opposite-sex marriage is harmless, it can't be proven that alcohol use is harmless, it can't be proven that airbags or seatbelts are harmless, even.
answer:
Valid


question:
All too often parents what their child's school to only teach stupid "feel good" classes that don't actually TEACH our children anything.
answer:
Invalid


question:
People in Massachusetts are free to believe what they want about gay marriage.
answer:

Valid