Top o’ the Stack.
I have found that it is dangerous to assume that others are essentially like oneself.
Psychologists speak of projection. To project is to offload into others one’s own attitudes, beliefs, motivations, fears, emotions, desires, values, and the like. It is classified as a defense mechanism. To avoid confronting an unsavory attitude or trait in oneself, one projects it into another. Suppose one is stingy, considers stinginess an undesirable trait, but doesn’t want to own up to one’s stinginess. As a defense against the admission of one’s own stinginess, one projects it into others. “I’m not stingy; you’re stingy!”
I once had a superficial colleague who published a lot. He was motivated more by a neurotic need to advance himself socially and economically, a need based in low self-esteem, rather than by a drive to get at the truth or make a contribution to his subject. He was at some level aware that his motives were less than noble. Once, when he found out that I had published an article, he told me that my motive was to see my name in print. It was a classic case of projection: he could not understand me except as being driven by the same paltry motives that drove him. By projecting his motives into me, he warded off the awareness of their presence in him, or else excused their presence in him on the spurious ground that everyone has the same paltry motivations.
Most of the definitions of projection I have read imply that it is only undesirable attitudes, beliefs, and the like that are the contents of acts of projection. But it seems to me that the notion of projection could and perhaps should be widened to include desirable ones as well.