Comment by subpixel

The most visible example of tribalism is when groups fail to update their ideas and beliefs as facts start to come in. You can't escape the religious parallel.

This occurs clear across the political spectrum, but a standout example is record-breaking levels of immigration in European countries like Sweden and Germany. Instead of realizing the policy failure and acting to fix it, the line becomes "it was the right thing to do, it was just done poorly."