Why an emotionless person makes you uneasy!

An article in The Economist points out that people experience discomfort when confronted either by a machine that seems to have emotions and feelings or by a person who does not. Our brains are built to mirror the emotions of others, but only others that we feel should have emotions. If we feel that an entity should have emotions and they do not show them, we feel uncomfortable. If we feel that an entity should not have emotions and emotions are expressed, we feel uncomfortable.  We think with our brains, including our emotions, not with our "rational" minds.