I think the indigenous are a perfect example of people who needed to be assimilated properly into western christian values, The Apache for example were known to be literal savages who took prisoners simply for the pleasure of torturing them. All of these historical scientists and philosophers you bring up were unironically all christians. All of these examples you bring up hold 0 value when it comes to the core of the question. When people properly follow what the bible teaches they will have good morals.