We spend a great deal of time working alongside others at work. In fact, if you consider that the typical worker spends 8 hours a day at work, it means that many of us spend more face-time with our colleagues than with our own families.
A more specific explanation of why workers struggle when they have to fire someone with whom they have a close personal relationship is something called cognitive dissonance. It’s a state of tension, which we want to avoid, that occurs when we perceive an inconsistency between our beliefs, feelings, and behavior. Reflection Line video.