[gh02t]

Chaos theory doesn't imply randomness, it implies unpredictability. Hyper sensitivity to initial conditions means you can't reliably predict the exact outcome, because it's impossible to observe all the relevant initial conditions accurately enough. I can't, for example, predict the trajectory of a actual double-rod pendulum except at fairly short time intervals even though the governing equations are known, because practically I cannot measure the initial conditions precisely enough. I would argue that even if you could write a master equation to predict human behavior perfectly it'd likely either be so sensitive to initial conditions it'd be useless or have so many initial conditions that you wouldn't be able to determine them all.

I guess I'm not super expert on QM or some of its different interpretations, but from our point of view there's not a whole lot of difference between multiple universes and actual randomness is there?