Humans interact with other humans on a daily basis (at least most do), and we are adapted over millions of years to be very good at understanding human features, body language, facial expressions, vocal tones, etc. We were bred for this ability and practice it every day so it is normal we are pretty good.
On the other hand being capable of recognizing problems with such things doesn’t mean we can convincingly fake it ourselves. We can look at an airplane crash and know it isn’t right without being capable of flying an aircraft. They are just different sets of skills, and knowing something is wrong is much easier than making it right.
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