On a bad day, I can take a little comfort in classical physics.
It is pleasing at some level to think that all of our actions, all of our thoughts, are just the inevitable result of the interplay of myriad particles and the forces between them. It absolves one from all responsibility and from all obligation. One need only count on the deterministic chug chug chug of the laws of physics to produce the next moment from the initial state of the previous moment.
Introducing quantum physics to the mix makes thinks dicier. There are aspects of the world at a subatomic level that are not predictable from the previous state of the system. They are truly random. One of the better known examples of this behavior is radioactive decay. Statistically, one can predict that roughly a certain amount of atoms will decay within a given time period, but not exactly how many or exactly when. And this is thought to be an fundamental property of the universe, not just a limit on our current theory's predictive powers.
This unpredictability seems to leave a little wiggle room for the concept of free will. If so, it is the free will of the universe, not of the individual per se. I (the thinking, living, breathing "I") have no more control over internal events at a quantum level that I do using the classical physics model.
On a really bad day, I can take a little comfort in quantum physics, too.
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