Mods should only be time-keepers and just introduce a topic, but not an actual question. For instance: Illegal Immigration - Mr. Biden, you have two minutes. Then Mr. Trump, you have two minutes. Then, Mr. Biden, you may ask Mr. Trump one question and he has two minutes to respond. Then Mr. Trump you may ask Mr. Biden one question and he has two minutes to respond. Then next topic. That would be useful.
The selection of topics itself is susceptible to bias.
common sense doesn’t work in politics