It identifies your "privilege" and cements the importance of immutable characteristics over character.

It's also important in grooming. Cement in kids that they're bad because of their immutable characteristics, really make them hate themselves. Then offer them an out to become good again, becoming gay or trans, they might take it. Being a "progressive ally" or Marxist that puts others with higher "progressive" value before yourself is also a less good, but still better option than being unrepentantly original sin.