Well genetically disparate people, exposed to a common stimulus, had the same response of high susceptibility to alcoholism. Which suggests it's more likely the environment and history, how likely is it indigenous people on different continents suddenly introduced to alcohol would all have...
Can't you use this line of reasoning to excuse every atrocity, ever.
Virtually all the wars, occupations, genocides, purges of the 20th century were culturally normal for a particular national culture.
Because no major discrimination occurred after 1788. If you want to find a slighted people...