Why do people lie? Maybe people are prone to exaggeration when its an idea they like or it's somehow attached to a position or stake they have taken (of)themsel

Why do people lie? Maybe people are prone to exaggeration when its an idea they like or it's somehow attached to a position or stake they have taken (of)themselves. But really the point I was trying to make by saying it's just another sentiment: perhaps the number of people put off by incomplete statistics is more than the people swayed by the dramatic results