Individuals prefer to harm their own group rather than help an opposing group
A great example of this phenomenon is the white response to desegregation in the United States.  White union workers voted against their labor interests, white flight from major cities, municipalities closing down public swimming pools, disappearance of social clubs, etc.  Community services were shut down in favor of the &quot;free market&quot; and we&#x27;ve seen the rise of pay as you go government services.  Even obviously true notions like &quot;it takes a village&quot; were derided. Collectivism and the notion of &quot;community&quot; were greatly reduced in response to desegregation.  The nation self immolated its social fabric in response to desegregation.<p>EDIT:  In the last sentence I wrote above “nation” should have been written as “white people of the nation”.