While I fully applaude your idea of a Pro and Cons set of articles, I believe you need to either get someone who actually believes what the say for the Con side, or someone with better arguements. The whole point of showing two sides of an issue is to be fair, and having the Con side be unable to present a convincing case is anything but fair.
The Pro-side articles have been convincing, soundly structured, and backed by reasoning, but the Con-side has tended to be emotionally driven. I hope to see some better slugfests in the future.