I find this disingenuous, infantilizing. Racial discrimination and warring has been happening since the beginning of (recorded) time. It stems, among many, many other things (this thing is incredibly complex), from the fear of the other’s “unknowns”, a somewhat justified fear of others, given humanity’s penchant for conquering the neighbors. Another factor is the use of each own’s feeling of superiority over the other’s, to cover for one’s underlying fear of inferiority in some way. Take the example (one of many, not singling out here) of the Jews assertion that they are god’s chosen people, thus everyone else being inferior.

While divide and conquer has been used since the dawn of time, and adapted by the capitalists, the sad and simple fact is that people fear that which doesn’t conform to their comfortable life scheme, that people want certainty, and having a “different” is unsettling for many, and demonization is an easy way to prop one’s belief structure. People who exchange critical thinking for a “safe” belief structure, find it threatening to have others challenge that, so they fight back, to try to have that attack defeated. This can be exploited by others, to rally against that perceived common enemy. Wave a flag, and all who have a common belief of that flag representing their values will rally.

People don’t want to think, and/or challenge their beliefs. It’s a comfort thing.