In truth I know very little about the subject, so this is somewhat an ignorant speculation, and I invite other insight, and comments. However I have recently been doing some self motivated research. To me the hidden variables theory makes the most sense, yet it seems most people are more inclined to believe Indeterminism reigns supreme at the quantum level. It seems outlandish to me that so many would presume there is no causal factors explaining some uninterpretable phenomenon regarding quantum particles, and that they would rather explain it away by saying particles act on chance to some degree. I've done a little bit of reading on Schrödinger's cat, Bell's theorem, and the de Broglie-Bohm theory. Can anyone lead me to good evidence that quantum mechanics is, or is not, determinate?