The wiki principe of multiple people editing articles and articles integrating multiple viewpoints based on good sources totally fails if there is no common ground left for people to agree. You can't write an article if some editors are accusing the subject of the article of commiting genocide while others think that they are waging a justified war of defense. Or if some people think that Donald Trump is the saviour of the United States that will make it great again and other people have more sensible views on him.