If you want a less inclusive debate, let the diehards dominate it.
Soon everyone with a moderate view is a ‘sympathiser/traitor/idiot’ and ‘doesn’t get it’.
Those with opposing views are bullied out of the discussion altogether.
The diehards win because others simply don’t care enough to keep going (hence why they’re not diehards).
Get a group of people with a moderate view together and the most popular members will be those who can express the most extreme form of that view.
Moderators are trained to remove posts and people which violate rules which can be written. They’re rarely trained to spot and tackle diehards who break unwritten rules.
They don’t remove members who violate codes of conduct which can’t be easily transcribed. They’re so rarely trained to stick up and encourage a minority view to have a more inclusive debate.
If you catch members making huge assertions (‘x’ is dead/ ‘x’ is the future) without referencing evidence, you have a diehard problem.
If you spot any variation of the phrase ‘s/he doesn’t get it’, you have a diehard problem.
If you see a discussion which began with opposing viewpoints and is now dwindling into a tiny minority of people discussing the small differences between extreme versions of that viewpoint, you’ve got a diehard problem.
If moderation is about moderation it needs to not just remove the rule breakers but prevent the extreme view drowning out the less engaged or interested moderate view through sheer force of self-assertion.