Not sure what you're doing with the 1970s analogy there, but I think you might be describing the Principal Agent problem, except maybe in an "externalized" form

Not sure what you're doing with the 1970s analogy there, but I think you might be describing the Principal Agent problem, except maybe in an "externalized" form. (See below.) Unfortunately, we people have an unfortunate tendency to attribute disagreements to "we're just not like them" and agreements to "we're exactly like them". (Tribalism rules IOW, but just on the basis of having the same opinion rather than Geography.). Even if most of the people on the Internets don't literally hate the people who have opposing opinions, they'll usually say that they do (again, on the Internets), leading to further fueling of the emotions/hatred of the "other".