That's because a program does not make correct predictions of its future acts that it wasn't programmed to perform.
You do not know of any “program” that decided to do something that it wasn't programmed to do by a volitional person, do you?
Deciding to do something and then doing it isn't properly described as correctly predicting the future, whether you're a program or not.
Programs can be developed to make their own decisions.
http://cds.nyu.edu/human-decision-making-machine-learning-processes/
Who programmed you to write the sentences in your post? Where is your program? Machine structure programming is detectable. Show us your program.
I am not a machine, that you could peek at my operating system. However, my operating system has stored the information from a life-time on a memory core of living tissue. Some of it has been routinely dumped, some dumped ad hoc, some written and rewitten over, but it's been a good life overall. I've been programmed by circumstance: every thought, every feeling, every bias I've had, every new idea I've encountered, and every decison I've made have contributed to my present configuration.
Name a program that correctly predicted it's future actions that it had never performed before, and that it was not programmed to perform.
Predicting future actions you've never performed before isn't something anyone does.
So you can't "will yourself" to write a grammatically correct sentence? Who willed it?
I can't "will myself" to write; however, if I do write it's by my will. Will isn't something we do, it's us doing something.
Us doing something looks a lot like automatons doing something.
I don't know what "philosophical 'zombie'" you are referring to. Chalmers' "zombie argument" is about experience, not will.
You don't know of any zombie that correctly predicts it future actions that it has never done before and that it was not programmed to perform, do you?
The zombie argument is about minds, hence will, and is relevant to arguments about mental events. Where the person inside, the "I," is absent, mental events are absent.
Zombies don't predict--they have no concept of the future. They do however make promises, make payments, and go about their daily lives living moment to moment.