Indeed, Michael, with the less sophisticated everything is about defending the tribe of which race is one of the more profound tribal indicators. In the hierarchy of tribal indicators race ranks far above, say, than national differences, like the Russians.
By being inclusive, supporting brown and black people, the tribalist see you as a traitor of your tribe.
During slavery days in the South, the planter class treated poor Whites hardly any better than they did their slaves. Yet when war broke out where the North threatened to end slavery, poor Whites joined the Confederate army in droves because slavery was the only thing that in their minds gave them the slightest status whatsoever.