I have actually been trying to flip it and think of it from the other side, to see if I can get my head around why this particular article caused such a strong reaction amongst so many posters. It has actually been very difficult for me, being such an objective and rational person who enjoys an open debate. But this is what I have come up with:
Consider for a moment that there is a particular poster on here who has, rightly or wrongly, developed a reputation amongst some for being both right wing and hating Muslims. And say that person posted an article which discussed the rise of Muslim hatred, say in Germany, amongst the far left. From a personal standpoint, as a rational and objective person, I would be interested in reading that article and understanding those developments. But what might make some other posters report it. I am trying to get into the mindset of the sort of person who would find that sort of thing so offensive that it needed reporting.