Identity politics are the babystep in understanding injustice. Practitioners of identity politics (PIPs?) care about what they perceive from their cribs. They're like the blind priests examining the elephant. They feel the trunk, so they are sure it's a snake and rail at anyone who says the trunk is only the tip of the elephant.
ETA: I don't mean that all PIPs are adamantly intolerant of disagreement with their understanding of power. The extremists are a minority.