Because humans are pattern matchers. We have to strive to eliminate or reduce conscience and subconscious biases to ensure fairness.
I know intelligent and successful people who would never take financial advice from someone with a beard for example.
Edit: maybe an interesting example. I grew up around smart woman and girls. From observation, I “knew” women were smarter than men. I was in college before I heard that some thought that woman were not suited for math. I couldn’t even process that. But people see patterns and extrapolate based on their observations and what they hear, and often start to believe something that does not exist.
I know intelligent and successful people who would never take financial advice from someone with a beard for example.
Edit: maybe an interesting example. I grew up around smart woman and girls. From observation, I “knew” women were smarter than men. I was in college before I heard that some thought that woman were not suited for math. I couldn’t even process that. But people see patterns and extrapolate based on their observations and what they hear, and often start to believe something that does not exist.