Since discussion of the 1921 Tulsa race riot that took place at the same time seems to have been allowed [3], I assumed this story was also within the rules. Is this not the case?
[1] https://news.ycombinator.com/item?id=24600458
[2] https://en.wikipedia.org/wiki/Greek_genocide
[3] https://news.ycombinator.com/item?id=22221180