Creating a Deductively Valid Argument

In preparation for the Creating a Valid Argument Workshop assignment due at the end of this week, you get to practice creating a valid (and preferably sound) argument on your chosen topic (the topic you chose in Week 1). Remember that a valid argument is one that is constructed in such a way that its premises, if true, would guarantee the truth of the conclusion. A sound argument is one that is valid and has all true premises. It is a challenging thing to make a valid (and sound) argument, so this discussion is designed as practice towards that goal.
You are going to present a deductive argument on your topic (either side). Make sure that it has a valid logical form and strive to make the premises true as well (the primary purpose here is validity but try to make the premises as plausible as you can). In their comments, your peers are going to see if they can find a way in which all of your premises could all be true and the conclusion false. If this is possible, then your argument is not quite valid yet. Do not despair, you will get to reply to them with a strengthened version of the argument, in which the goal is to eventually arrive at a version that is valid (while keeping premises that are plausibly true).

After testing for its validity, your peers will get a chance to investigate the truth of the premises (focusing mostly on the new ones added to make the argument valid). Perhaps there is a counter-example to one of your premises. If a peer presents such a response, would you agree with the objection? If so, how would you revise the premise to make it true? Would the new version of the argument be sound? If not, how would you respond to the objection?
Guided Response: In addition to your original post, post a minimum of three responses for a total of at least four posts. At least two responses must be to your classmates; the third response could be to a classmate or your instructor. Be sure to post on three separate days throughout the week to promote further engagement and discussion. Each response should be a minimum of 75 words.
In your replies to others, offer helpful feedback on their arguments. In particular, comment on the following:
* Validity: Is there any way that their premises could all be true and their conclusion false? If so, explain how. Can you suggest why a new premise might need to be added in order to make it valid?

* Truth of the premises: Are all of their premises actually true (especially the new ones added to make it valid)? If not, provide a counter-example, or explain why somebody with the opposing point of view might object to the premise. Keep in mind that objecting in this way to an argument is not impolite; you are just helping them to improve their reasoning. When someone responds this way to your own initial argument, be sure to respond to them with either a new, sound version of your argument or with a response to their objection to a premise (or both). Keep the conversation going as long as you can until you are happy with the finawzal version of the argument.