That's funny.
Without getting into the "any airplane can be flown single pilot and all FOs are useless baggage" argument promulgated and propagated by the chest-thumpers, there are a number of good reasons why crewed airplanes have crews, and a lot of it in my book has to do with making sure that at least one pilot is "minding the shop" with regard to positive aircraft control and terrain separation at all times, especially when things go pear-shaped.
(This wasn't always the industry's understanding; Pan American and others crashing perfectly good airplanes had something to do with this understanding being developed, though.)
A second set of eyes and hands that are trained to work with the first set is invaluable. Especially at night, in mountainous terrain and miserable weather. Of course you COULD do it by yourself, but why would you? If the operation requires (or provides) two pilots, use "all available resources..."