Free Will

[Kingpin]

Or in other words, due to the structure of your body.  You did not choose to have a hand in the first place, or nerves, or a brain, etc.  That is all due to things prior to your existence. Whether that is due to "determinism" or random chance or whatever, clearly, you did not choose it.  Everyone of sense knows that, so why is it that people pretend it is not the case?*  

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*As is often the case, the answer to the question resides in the question itself.  It is not everyone, but everyone "of sense" that was specified, and it is those who are lacking in sense who fail to realize such obvious facts.

I suppose one reason people may doubt that is the case is that they're not materialists, and how one defines being or self - whether or not mind emerges as something distinct from a given sum of physical parts, or is itself a physical process, or if there is something above and beyond the objects of sense that is inextricable from reality or the experience thereof - probably has implications for their view of the will i.e. what it consists of and how it is exercised.

I agree with this 100%.  Our presuppositions to the definitions of 'self' and 'mind' certainly influence our extrapolations on such topics.