On another point, what constitutes a manufactured disagreement and what constitutes a genuine one?
As to what constitutes a manufactured disagreement, that seems somewhat self-evident. A more familiar term might be "wedge issue". You correctly mention upthread how disagreements on even the most contentious social issues was handled peacefully and arguably with some tact. This is demonstrably no longer the case so my question to you is this: what changed, who changed it, and who's benefiting from the change?
Existence of batsh*t crazy conjectures do not imply that the idea of entertaining multiple hypotheses has no value.
With accumulation of evidence, probabilities attached to the propositions are revised. Thats how scientific investigation evolves.