I think the workplace method works well there and would help improve answers here.
Saying what the answer is is not enough. You must explain why your answer is right.
It eliminates one line and me too answers and helps to improve answers as a whole.
That said good questions beget good answers. Bad questions beget bad answers. If you ask a controversial question in an open ended format you are probably not going to get good answers.
For instance "What are the key factors for the rise of nationalism in Europe?" I think a question like this is far to open and subject. I can not only see a book about what lead to calls for nationalization in Europe, I Can see several volumes focusing on the cause and effects in different countries. I suspect the German's answer is liable to be almost the exact opposite of the Greek's. Neither may be wrong but there is no "right" answer because there are so many factors. However a question that asked about a specific factor may get much better answers. It is focused and people can look more objectively at a specific factor than they can when looking at the big picture. For instance "How has the Eurozone's reaction to the Greek crisis influenced Spanish policies toward nationalism?" Is more likely to get good answers. Because it is focus on a specific cause and area of effect.
Edit because I finally saw the call from the SE Overlords Facilitators asking for more references.
We could and probably should require references for claims or inferences of fact. For instance if someone said that the RNC Spokesman called for the wholesale slaughter of baby bunnies, then theirthere should be a reference requirerequired, even if it is just a date, time, and location of the conference where it was called for, though a link to a video clip or transcript would be better. If someone says that the DNC is against that policy then it should have a reference as well. Even if it is just a claim on The DNC will never stand for that activity, it needs a reference. Qualifying it with "I believe the DNC will never stand for that activity" should not be acceptable because that is bad subjective opinion, unless it is backed up with a reference like because the "DNC Chair said that they have been in discussions with the party leadership on on how to contest this attack on baby bunnies." and include a reference to that reason.