You're arguing that AI will lead to much more nuanced discourse, and much more complex and detailed pros and cons rather than the ruffian binary polarization we have now, and I agree.
No, it'll be the exact same binary polarization. One side keeps arguing "weed doesn't lead to violent crime" and the other side keeps arguing "but look at all the ways it does harm people", because that's the news stories they've each chosen to see, exactly the same as any discussion I've had on the subject to date.
The issue with journalism isn't people outright lying. It's quite rarely a failure to understand the problem space either. It's framing the discussion in a certain way and picking and choosing which facts to prevent. Having multiple AIs which pick out different things to tell their readers doesn't solve that problem at all.