Alright, so those of you who remember my "Fate exists?" thread will probably notice some similarities, but bear with me :)

Let's get right to it with an example where most people would say that a decision has been made, like when some guy decides to rob someone for money. Now, if you were to reverse time again and again (it could be any timespan from years to minutes), do you think that (a) this guy would have decided to rob this person after each time reversal? (As supported by determinism.) Or do you think that (b) each time reversal would have resulted in him making different decisions each time? (As supported by quantum theories.)

Those are really the only two possible outcomes that comes to my mind, and this is where the problem starts. If he decides to rob the victum every time, then that suggests that he couldn't possibly have made another choice at the moment, meaning that he has no free will, but follows a predetermined pattern that has already decided all of his future decisions.

If the outcome would be different each time, on the other hand, wouldn't that too suggest that he has no free will? If each and every decision you make throughout your life is based on randomness then they might as well have been completely different, suggesting that you never really had control of any of your actions, and thus no free will.

Any thoughts?

Quantum effects are only significant on a microscopic level. On a macroscopic level their effects are 'averaged out' in the thermodynamic/entropic soup, thus we have common properties for materials etc etc.

Translated: I don't think quantum theories are significant enough in this debate, but that I haven't really read much on that strand of the issue. 

While I wouldn't see that "Free will" does not exsist, it is likely that if you reserved time and exactly nothing changed up untill the point that "he" decided to rob someone, that he would decide upon that action time and time again.

Should sometime (Even if it's tiny) change before that with him or around he, the decision could very well be different.

Do you think that we all have a free will?

Also, I have made it more clear in the OP now that it doesn't matter how long you reverse time, meaning that quantum effects most certainly would have an effect if they exists.

But then his decisions would be predetermined.

It's a paradox, really. The only way you could possibly make a (non-random) decision is if the world is determined, which means that every decision you've ever made were already decided before you made them. Thus, the will is determined and not free.

A difficult question, probably one that we will never answer. 

Ultimately, as a libertarian might argue, it is vital that we all act as if we are free agents, even if it is out of ignorance of external causes.We only have free will in that we are conscious of the experience of deliberation over situations; this restores moral responsibility in society.

The universal law of causation may apply, but internal causation may be viewed as an equivalence with human freedom as we must assume all internal thoughts are our own, or all speculation is meaningless.

I was pretty rushed when writing it but I feel it makes a good point. It's a bit of a cop out because it doesn't answer the question, but I don't think we can answer the question, and so acting in the best possible way (keeping moral responsibility in society) is the only realistic thing to do, and that requires assuming we are free.

EDIT: I dont get what you're talking about there with quantum, please elaborate!

But the thing is that there is always a reason for your "decisions". If those reasons are determined, then so is your "free" will. If those reasons are not determined, then they have randomly occured (as opposed to occuring following a pattern), thus making your "free" will based on radom events.

Free means independent, so it can't be dependent on randomness.

(You better read all of this, Basil!)

You just confirmed my statement.

Define free will

Free will = The ability to make independent decisions and have an independent opinion.