According to PG's guidelines, the criteria roughly boils down to whether or not something gratifies your intellectual curiosity. Shall we flood HN with stories of corruption in the Congo, Thailand, Haiti, Russia, Egypt, and so on? Maybe HN should have a weekly feature of poverty-stricken AIDS victims in various countries in Africa? Perhaps title this weekly feature "Poverty Perspectives Beyond the Cubicle"?
Stories like these, while tragic, are not new phenomena. Unless one is naive, one should already know that the world is full of corruption and that there isn't anything particularly novel about this brand of corruption. On the other hand, a story about cleverly planted subtle bugs in a high-frequency trading algorithm would make for a great HN story involving corruption since the details would be intellectually gratifying. But plain old selling of supplies meant for the poor? That's been going on forever. How is your intellect gratified by hearing about yet one more case?