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@Skilgannon, I never said or even implied that the universe is a simple system. Or, for that matter, even comprehendible. All I meant was that basic logic would suggest that the universe is a deterministic, albeit extremely complex system.

I'll try rephrasing my argument. I define "true" randomness as having different outputs despite having exactly the same inputs. By "seed values" I mean anything that could possibly affect the result. In an algorithmic example, that would not only be a method parameter, but also system time, or any other variable that could affect the result. They could even be things like the CPU temperature or even the Earth's gravity. So, from the perspective of the program that called the random generator method, the result is truly random because the result could be different even with the same initial method parameter. But, if you widen your perspective to include every "seed value" that could possibly affect the result, it becomes a deterministic system.

If something that appears to be truly random turns out to be deterministic with a wider perspective, couldn't subatomic particles?

I realize this probably sounds like the ramblings of a madman, so I would be glad to clarify if you need me to.

So, by widening your perspective to include all seed values, you essentially support the multi-universe hypothesis? With each universe having its own (enormous) set of seeds, and then behaving entirely deterministicly, although that determinism is completely invisible to those who reside within it?

A multiverse is one explanation. Another one is that we are simply missing a large part of what's going on in the universe. The latter doesn't seem too hard to believe, especially considering that 96% of all energy in the observable universe is a mystery to us.