As far as the P&S board goes, there's no way I'm posting there. I don't think anybody changes their views based on forum discussion, and it all seems to be a big dick-waving contest to me. And when you can't get people to agree with you? Yep, the end result is insults and you hit the nail on the head with that one.
I think any reasonable person should have no option but to change their views if the observable events presented by others reasonably/logically requires such action.
Most peoples opinions/views (including my own) are based at times on incorrect/incomplete data. The fact we have made analysis upon such data is only negative if we refuse/ignore new hard evidence/information that conflicts or was missing and refuse to reanalyse again.
Like I say people tend to make an analysis and form opinion on bad data . They will voice that opinion and then dig their heels in to defend it at all costs regardless of conflicting observable and factual events/information. They then become unreasonable and irrational.
Really one should be pleased that someone who has an opposing opinion comes along to help you examine the data you both have access to. Of course sometimes people are over exuberant in their views and it can be hard to alter your opinion/perspective on things because that can have huge knock on effects to other opinions/views you may have and even your views on your own past behaviours causing great stress and regret.
Of course many opinions on broad things like left and right political views have some many factors/permutations on so many levels then to have a conclusive firm opinion is almost impossible. This is where AI will be able to develop a more logical/informed opinion if only based on probability and the scale of the data it can draw from.