This is a great topic, I've joined just to write here. I'm a believer in Hard Determinism, and the two arguments that go against it seem to be;
- Randomness
- Free Will being an Axiom
Firstly,
Randomness: I think that the illusion of randomness stems from the human inability to comprehend such extraordinary events and complexities of nature. An example is the fact that no human instrument can calculate when a single atom will decay. Or the example of how we cannot know the position and velocity of an electron (if I'm not mistaken). We either know one, or the other.
As
out of whack mentioned:
"Knowing and predicting are quite different from determinism. Regardless of the existence or non-existence of determinism, you still cannot know everything and you still cannot predict everything. The universe (all there is) is too big, complex and inter-related for any part of itself to be able to do that."
But just because we do not understand it, does that mean its random? Random in itself is flawed. How does nature create randomness?
For example; You have a letter, A, and at a random point in time that letter will change from A to B. Its completely random. There are two problems with this.
Firstly, the fact that it will happen makes it not random at all. We know for sure that it will change, just not when.
Secondly, what cause makes it change? For something to change, it needs to be changed. You can't type a letter on a keyboard without pushing down a key. You can't stand up without something (or things) controlling your muscles. Everything needs a cause to have an effect, and the only way something can be truly random is if its cause is random. But then how far back does this have to go?
We live in a world that has rules. A computer physics simulation has laws, as does the world. Just because we cannot understand them, does not make them random.
The illusion of Randomness exists only because the human mind cannot, or does not, comprehend what’s happening. Its impossible to program randomness, in a computer and in a world. Determinism is simply cause and effect.
Your a nice person because you've grown up with good moral teachings, because you've naturally (nature is deterministic) picked up the traits of a nice person. Every thought you have, has been determined.
Which brings me to the next point,
The Axiom of Free-Will; Sure you could say free will exists, as a human does what he wants. He has the freedom, the liberty, to do what he likes. However, this is confused with freedom of mind. Your mind is not free, it’s the opposite. Everything you do is done for a specific reason. A cough, a laugh, a hand shake, a bite of food etc. Its impossible to do something simply to do it. You might attempt that, but ultimately your doing it to prove a point, which means your not simply doing something to do it. Everything you do, you do for a reason (or multiple reasons), however small or simple. More importantly, that reason is always fixed, it cannot be controlled at the specific time of the decision. I eat peanut butter because I like it, fixed. I’m about to leave for work because I want to get to work on time for my new job, fixed. I didn’t choose to want to make a good impression, I just do. Its me.
Freedom of mind implies that your mind has no influences. Your mind is random, which its not. Everything, literally everything you will ever do/have done, is done for a reason. Randomness doesn’t fit into this.
When I hit a key on a piano, there is a chain reaction that causes sound. This can only happen if the properties of the piano are fixed. If one part of the piano suddenly lost a few laws of physics, it may go through the other objects, make light instead of sound etc. I struggle to see how people can honestly believe anything other than a deterministic world. You tell me how randomness works, how an atom suddenly decays (atom decay follows a pattern, just like the “randomness” of a flip of a coin. The more coins you flip, the clearer the correlation).
Cheers.
EDIT: The other argument is that of changing the future. What your actually doing is acting out the deterministic world. For example, think of events as a train track, with multiple routes. A train follows one path out of infinitely many. Why? Because its determined to do so. If you change your mind, determinism has already factored that in. If determinism was a being, he'd tell you that he knew you would change your mind, because something made you change your mind, that had already been factored in. You cannot change a deterministic world, as whatever happens, has already been determined. Laws of physics (even ones that humans cannot understand) means determinism. Full stop.