Just because no cause for atomic decay can be found, it does not prove that none exists. For everything in existence to follow the rules of determinism except for atoms themselves is a bit strange.
If you think that modern physics simply gave up on trying to find a cause to behaviour like rando decays, you would be wrong. There actually is hard proof that the world is not entirely deterministic. try googling "Bell`s inequality". By the way, this kind of behaviour is the rule rather then the exception.
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