Are We Gregarious?

As  a daily commuter of the Lisbon metro, I sometimes wonder if humans are truly gregarious and sociable as they seem. When a carriage is empty, this is the plan:

When the first commuters get in, they never seat near each other; they instead prefer to occupy the islands and be left alone inside it:

If we were gregarious animals, shouldn’t this be the first layout of occupation?

London Underground

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