This. The names of many tribes is simply "the people" in their language. You can easily read into it that those humans not that are not members of their tribe are not people.
http://www.native-languages.org/original.htm
We invented huge anonymous cities where either tight surveillance or gang wars flourish, extermination camps, total war and many other wonders. Let's explain to any tribe that we, 'people', painfully devised and realized ways to massively and indiscriminately kill very remote civilians using dedicated complex machinery (ICBMs), then discuss about who is 'people' for who.
Comparing the 'costs' of nearly-constant but limited tribal violence to our own 'civilized' violence isn't easy.
Indeed. Therefore the "outsiders aren't real people" stance isn't specific to tribal life.
Upon reading (above) "Tribal politics are brutal" and "Life was way harder" one may think about the way we wage war, establish the rat race in huge cities, try hard to control everything everywhere to the point of practically barring anyone to opt out... "brutal"? "harder"? Doubt so.
Please read "armenarmen" comment, above: "those humans not that are not members of their tribe are not people". Albeit difficult to grok, it seems pretty clear to me.
That's not my understanding, as he answered "This." to a post containing "Tribal politics are brutal, and any ancient community would have a very strong sense of identity, and about who belonged and who didn't. Life was way harder...".
