"You just turned 100 today - what's your secret to a long life?" - No matter what the answer will be, I guarantee you that there are millions of people in the world who do the exact same and still die young. But yeah, of course aunt Margharet only managed to live an entire century because she ate three cans of surströmming every week, no doubt. Genetics, healthcare and lifestyle have nothing to do with it. Nothing at all.
Edit/addendum: Weird specific example
Something similar was also my no.1 pet peeve on reddit whenever people argued about how the Blood Moon works in Breath of the Wild. It's an in-game timer of roughly 3 hours, but the game does not tell you about it, nor does it display the timer, and back when the game code wasn't cracked yet, there were a LOT of outrageously weird theories about how to allegedly make the Blood Moon appear.
So you just "made" a BM happen by running straight into a wall for 3 hours? Yes you got a BM, but not "because" you were running into a wall for 3 hours, but because the effing timer was up. The game does not care for WHAT you do in that time.
So you reloaded and ran into a wall again and the BM happened again? It is STILL not because you ran into a wall - you rewinded the effing timer by reloading a save file from before the event you're trying to trigger, and then the timer was up again. (They never bothered to check whether it would happen if they did not try to trigger it with their chosen tactic)
It is really really hard to try and convince these people that they're wrong, because once they're convinced that a specific action yields a specific result, they WILL keep doing it over and over again until it "works" and then see it as proof. But by the same logic you can also throw tomatoes at a wall until it starts to rain and then claim that the rain happened because you just threw 547 tomatoes against a wall. And then you continue to throw tomatoes because it "worked" last time ... and if it doesn't rain then you just didn't throw enough tomatoes yet.