"Race is just as much, if not more of a social construct as gender."
Consider Barak Obama. I feel like he's been labelled as a black man by society, but would he skewered if he were to identify as a white man? He's as much white as he is black.
In this case, the officer in question even brought up the fact that he had black ancestors. So why shouldn't he be able to? Elizabeth Warren seems to have been given a pass for saying she was Native American, even though she wasn't. And furthermore, even if she were a descendent of a white person who was raised by or amongst Native Americans, why could she not be able to claim it?
What this shows to me is that identity politics are not so much an honest effort to allow people to align with who they identify as, but rather a political tool for progressives in an attempt to manipulate society.
I was glad when restrictions on gay marriage were put to bed, but also very disappointed that the same people who championed gay marriage remain some of the staunchest opponents to polygamy, even though both represent government telling consenting adults who they can or cannot marry.