You're looking at it with the benefit of filtered hindsight. How many other things were they also told? They had to distribute their investigative efforts to wh

You're looking at it with the benefit of filtered hindsight. How many other things were they also told? They had to distribute their investigative efforts to what they reasonably thought were the most likely culprits. Once those didn't pan out, they did take the clue: > However, as each new test failed to yield evidence for any old or new pathogens, the investigators returned to the old man’s words. Cassava was an important element of the local diet in Nampula, and therefore hard for Cliff and her team to overlook if they were considering a nutritional cause for the puzzling paralysis. Doesn't seem arrogant at all.