Great, question. @ETpro.
At the end of the first paragraph in your link I think there’s a pretty significant clue. It says: “This is a stochastic process on the atomic level, in that it is impossible to predict when a given atom will decay,[1] but given a large number of similar atoms the decay rate, on average, is predictable.”
If on average atoms of the same type decay at approximately the same time, a law governing the decay of radioactive isotopes is implied. This is to say, they are decaying not truly randomly, but according to some unknown principal or system which they can’t defy.
Side question: Is it even possible for a radioactive isotope NOT to decay? Or must they decay by, again, some unknown law?
The point is, there’s a cause for the decay. We don’t know what it is, and hence we can’t yet investigate that cause to determine nanosecond precision of the event. But with certainty, these radioactive isotopes are obeying some rules and doing their thing on a punch clock.
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As an example, imagine a crazy ass hurricane flowing through a village that destroys every house. Every house will succumb to the winds on their own time. But all approximately around the same time as the hurricane existed. There are so many factors involved in why a house might last a little longer under pressure or give in quickly that it would be difficult to predict which one would go first, seventeenth or last. It would also be difficult to predict the nanosecond that any single house might collapse or get blown away by the pressure they are experiencing. Our not being able to predict these things with accuracy doesn’t imply that the the materials of the houses have an uncausal link to reality. It simply implies that we don’t know exactly when it will happen.