How flexible is the principle of causality?

[Mudhammam]

An obvious example is the time at which individual nuclear decays happen. This is not something that is even in principle determined in the context of ordinary quantum theory. Two particles scattering off each other will emerge at random directions distributed according to their outgoing wave functions (think double slit experiment)

http://en.wikipedia.org/wiki/Scattering_theory

this will almost immediately lead to completely different outcome if you rewind the clock and start over with the same quantum state.

Will it? Are you sure that randomness isn't really a manifestation of hidden variables? How do you know that unpredictability is true temporal randomness?

What do you think bennyboy?

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A big part of me thinks it must be random...yet this notion, while apparently true in many regards, is so counter-intuitive to my everyday experience in many ways as well.

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I wonder if a portion I am omitting, which may or may not be true, is that the randomness largely occurs outside of developing systems...but once systems emerge from the chaos (Universes, solar systems, ecosystems, biological systems, etc.), then other (Newtonian) laws ensure that a much more orderly fashion follows. Not sure if that is the case, though it still wouldn't really seem to undercut the demand for a system that exists at bottom to produce anything like other sub-systems at all...