Reply #1: Determinism is a very interesting concept.

[trotsky]

Even when it comes to "free will." Because ultimately, there is a reason WHY someone chooses one alternative over another. It might be a trivial reason - preferring red over blue - but it's a reason nonetheless and one that may arise from your past experiences, which of course determine how you view a lot of things.

And hey, if you can't decide and instead flip a coin - well, the mathematics & physics to determine a coin flip result are certainly very complicated but if you could work everything into it (the initial angular momentum of the coin, any rotation, the arc of the path it takes, etc.) that's a deterministic result.