I read somewhere that, especially with a stick, that there's a certain degree of 'human nature' involved as well. It was something to to with people subconsciously preferring to push in the direction that their palm / forearm is facing as opposed to pulling with their fingers when it's a reflex action.
It makes sense because if you pull right there's always the possibility of losing your grip. Left has the full weight of your arm behind it.
Can't remember where I read it. But it was definitely fighter pilot related.
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