Even if that were true, and it clearly isn’t, then what explains the vast differences we see? That would then have to be culture. Which leftists do accept as being true. What else would be left? Yet they then somehow ignore it! If culture is the definitive factor do they think ‘the only differences are culturally based so all we have to do is place someone in a different culture, in this case a work culture and 1000s of years of ethno and societal culture will be instantly erased and everyone will be interchangeable’? People who think like that clearly have no real values of their own.