Facebook’s total inability to keep itself from being a convenient tool for genocidal incitement in Myanmar has been well-covered, now a case study in how a company with such immense global power can so completely fail to use it for good. But a new report released this week by the United Nations fact-finding mission in Myanmar, where calls for the slaughter of Muslims have enjoyed all the convenience of a modern Facebook signal boost, makes clear just how unprepared the company was for its role in an ethnic massacre.

In a recent New Yorker profile of Facebook founder and CEO Mark Zuckerberg, he responds to his company’s role in the crisis — which the U.N. has described as “determining” — with all the urgency and guilt of a botched restaurant order: “I think, fundamentally, we’ve been slow at the same thing in a number of areas, because it’s actually the same problem. But, yeah, I think the situation in Myanmar is terrible.” Zuckerberg added that the company needs to “move from what is fundamentally a reactive model” when it comes to blocking content that’s fueled what the U.N. described last year as a “textbook example of ethnic cleansing.”

The new report reveals just how broken this “reactive model” truly is.

According to the 479-page document, and as flagged in a broader Guardian story this week, “the Mission itself experienced a slow and ineffective response from Facebook when it used the standard reporting mechanism to alert the company to a post targeting a human rights defender for his alleged cooperation with the Mission.” What follows is the most clear-cut imaginable violation of Facebook’s rules, followed by the most abject failure to enforce them when it mattered most: