In revealed preferences we look at what people actually do as opposed to what they say they will do or say the prefer. So for example liberals who claim to highly value diversity are often shown to actually live in very not diverse places. They say they believe in diverse schools, but when their children arrive, they quickly move to neighborhoods with very little diversity or diverse as in "lots of Asians".
But back to implicit bias. What the current SJW thinking [sic] tells us is that people act in accordance to their biases when in fact people often act in opposition to their biases, particularly when life and death are not in consideration.
The finding suggests that while white officers may have an “implicit bias” to associate blacks more quickly with danger, they hesitated longer to react, explained Lois James, lead researcher and assistant professor at the university's College of Nursing.There it is.“That’s the driving message of our paper, implicit biases do not predict how people will behave,” James said.