> there never has been any scientifically well-supported theory showing genetic causes for observable differences of IQ between ethnicities I feel like this is

> there never has been any scientifically well-supported theory showing genetic causes for observable differences of IQ between ethnicities I feel like this is the key to your argument, but I'm having a hard time understanding what you're trying to say. Theories don't show causes, they attempt to fit data into a mental model that can then be falsified or fail to be falsified. Are you saying we should reject data because a satisfying theory hasn't been found yet? I don't agree with that principle. In my view, that seems analogous to rejecting the idea of gravity because we don't have a good theory of how it works, or that the data leading to the string theory hypothesis should be discarded because we can't test and falsify string theory.