On one hand, we have a supervisor having to take a diversity course, and an employee getting a written warning about their performance. On the other hand, a person is losing their income and health insurance. If the evidence equally supported both sides and we had to guess, the detrimental effect of incorrectly supporting one side is vastly more significant than incorrectly supporting the other.

Yes, but don't you get it? Someone might be getting called racist when they're not, and that's obviously the worst thing in the whole big wide world! And on top of that case, a black person will get to under perform in the workplace! Oh the humanity! Will no one think of the children?!?!?!