I think something that created a graph of assertions and logical dependencies between them would be really cool! Crowdsource assertions and assumptions (dependencies on other assertions) for each article. For example: "Russia hacked the DNC" or "The CIA has the ability to impersonate Russian hackers" would both be assertions and you could browse content that depended on either of those assertions or on logical children of those assertions.

The coolest thing is that it would actually make a distilled "skeleton of beliefs" that supported each perspective. You could quickly understand alternate points of view by skimming the assertion graph. It would encourage critical thinking about one's own perspective as well. You could even do belief "theory-crafting" by toggling beliefs on or off and seeing what the logical consequences would be for different claims credibility.

Instead of disagreements turning into character attacks it could be a very discrete "you agree with assertion [url to assertion and evidence/counter-evidence] and I do not."