IMO Facebook should be able to police its own platform, so if it has a large presence in Ethiopia then it needs to police that part of its platform (ideally using employees based in Ethiopia). If it feels it can't effectively police Ethiopian Facebook without amplifying hateful/violent messages then they shouldn't be operating there.
It makes sense to me that Facebook should attempt to follow the laws of the various countries in which it operates -- though obviously vague laws prohibiting "sedition" or "promoting unrest" make this hard.
But it seems quite difficult to navigate less codified cultural topics. For example, the problems in Ethiopia turn on old lines of ethnic division. It's tough for me to imagine that Facebook will somehow arrive at a way to manage a problem that's troubled Ethiopia for so long, even (especially?) if it uses local employees as moderators.
