Perhaps someone else more knowledgeable can chime in -
Isn't true randomness unverifiable? In other words, it seems (to me) that there is no body of evidence that would verify that a particular event was "caused" by (i.e. was the result of) true randomness (as opposed to the result of hidden events/variables)
In the particular context of this post, it isn't. The local hidden variable theory is conclusively wrong. Not sure if there are recent results about nonlocal hidden variables, but last time I checked we couldn't say anything about that.
There's a great (and pedagogical enough) discussion of this at the back of Griffith's Introduction to Quantum Mechanics
Isn't true randomness unverifiable? In other words, it seems (to me) that there is no body of evidence that would verify that a particular event was "caused" by (i.e. was the result of) true randomness (as opposed to the result of hidden events/variables)