It wouldn't even need to be a stupid person. Just a person who probably won't get in trouble for erring on the side of caution, but could face serious consequences for failing to enforce Facebook's policies.
That's usually a decent approach, and in most cases it doesn't cause an uproar. In the few cases where it does, the hot potato gets tossed up the chain of command until someone reverses the decision.
Or, as others have mentioned, the deletion was triggered automatically when the image was flagged by too many people. I sympathize with the deletion algorithm here. If I slave over a hot CPU all day just trying to do my job, the last thing I want to do is get sent to /dev/null because I failed to delete an image that really was inappropriate.
