Oddly Wired
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halo effect

You judge strangers as kinder based purely on appearance.

The halo effect is the tendency for an overall impression of a person to influence your feelings about their character.

Studies have shown that observers attribute positive qualities like intelligence and kindness to physically attractive individuals without any supporting evidence. You use one salient trait to paint a complete picture of the person's personality. This creates a persistent bias where you assume 'good' is holistic.

You mistake pleasant features for a pleasant character.

Where this comes from

Study
Edward Thorndike, 1920
What the check found
The definition and attribution to E.L. Thorndike (1920) are factually correct despite the reference material containing a distracter concerning a different historical figure.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.