Which of Diamond's arguments in Guns, Germs, and Steel do you find weakest?
He often says things like 'now this isn't ALWAYS the case', but ignoring that,what are some of his main ideas that you feel you could easily find exceptions for?
One of Diamond's arguments that I find least convincing is his argument (as at the end of Chapter 6) that farming societies will always defeat nomadic societies.
Perhaps the clearest example that could be used to try to refute this argument is the example of the Mongols. The Mongols were a nomadic people who essentially did not farm. Even so, they were somehow able to use their mobility and their political organization (which Diamond says should not be very advanced in hunter-gatherer societies) to conquer a major empire within relatively modern times.
Of course, the Mongols did have domesticated animals, but they were not a sedentary society and did not raise crops. This should have disadvantaged them according to Diamond. The fact that they were so successful seems to indicate that there may be a problem with this aspect of Diamond's argument.