My completely unqualified opinion is that this kind of behaviour is linked directly to intellectual ability. Returning the cart requires self-discipline but also implies a thought process around upholding and creating social order. Even fear of shame implies a desire to uphold social standing with others.
Whereas not returning the cart can only be explained in two ways: a thought process that says ‘not my problem’ (selfish, disorderly, bad for society) or no thought process at all, like an animal with no higher order thinking.
Whereas not returning the cart can only be explained in two ways: a thought process that says ‘not my problem’ (selfish, disorderly, bad for society) or no thought process at all, like an animal with no higher order thinking.