So much of it is association. The human brain (for better or worse) is really good at building comfort in routine. If you see the same person over and over, you

So much of it is association. The human brain (for better or worse) is really good at building comfort in routine. If you see the same person over and over, you naturally will think they are just "part of the environment." They belong there. You get to know "how they tick" and even if that person has faults, you sometimes overlook them because you have built up a rapport. Yeah, Billy in accounting can sometimes be late, but he is friendly and always knows the scores from the big game. We would rather a known variable, even if it is not the best instead of an unknown that might be better.