[wisty]

I don't think Diamond was a reductionist, he often considers multiple factors, as many as most academics IMO.

Did the professor have a single factor who they tried to reduce anything to (and was mad that Diamond didn't share the same favourite hobby horse), or consider multiple factors (like Diamond, but maybe with a different set of factors), was the only way to solve a problem "study it lots and trust the expert", or is the solution "not everything can be solved, sometimes Donald Trump's guess is as good as mine" (but with more fancy words I'm assuming).