Comment by jjk166

Same way as the hard sciences - you make a prediction for something that you would never observe if the hypothesis is true, and then you go look for it. If you find it, then the hypothesis must be rejected. I might suspect that hunter gatherer tribes don't go to war, and I might observe many such tribes which don't, but that doesn't prove my hypothesis right. On the other hand, if I can find just one tribe which does go to war, then the hypothesis has been falsified.