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Personally, it is a sincerity thing. If you can't look someone in the eye as you speak to them, it makes you seem insincere. The job interview example you gave is a good one - Why do I think you are being straight with me if you can't look me straight in the eye when you talk to me? It makes me as the interviewer skeptical. It is also a personal connection thing - people want some sort of connection with others. Eye contact makes a conversation seem more grounded and connected personally.
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