A good point. A friend of mine pointed me to six hats[1]. Currently the mock-up mirrors a two-level reddit in its dialogue with a tight focus on facts (the information-based white hats).

The advantage of having only facts is that the interface is simpler. The disadvantage is that not all views might be represented, thus impeding dialogue.

[1]: http://en.wikipedia.org/wiki/Six_Thinking_Hats