The obvious, egocentric explanation for why we do this is that it makes us feel better about ourselves. But there are at least two other more innocent explanations, which are based on subtle flaws in our thinking.
The first possibility is that we find it easier to consider the favourable evidence for a single person than we do for a whole group. Consistent with this is the finding that people tend to be biased when comparing any single individual, not just themselves, against a group of others.
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