Biases exist for a reason. That tiger in the woods could be just a big cat, but my bias tells me he can eat me. Is it wrong and should I be aware that not all tigers eat people? Now, bias is usually applied when you don't know somebody. That black guy on an empty street at midnight, should I consider him completely harmless? In the middle of a black neighborhood? Well, I wouldn't. Why? Because of statistics. Does it make me a racist? What if it was a white guy in the middle of a poor white neighborhood with the same crime rate? Same reaction. What if I live next door and know that black guy? Now it depends, because there is no bias, I know exactly what to expect. Maybe now I know I can be killed (or quite opposite, I can say hello), but I _know_ it, not assuming, and now his skin color or neighborhood means nothing at all. Bias is a survival mechanism to substitute information we can't get by other means. Judging somebody by their skin color while _knowing_ them is a different story.