Once more, for the hard of reading:
No need.
However, just for fun.
Libertarians and hard determinists agree that determinism and free will are incompatible. The hard determinist rejects free will. The libertarian rejects determinism.
Yes. And given that Libertarians reject determinism, this puts their version of free will at odds with compatibilism
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The hard determinist says given antecedents x and y, a person MUST do z. The libertarian says given antecedents x and y, a person can and will do whatever the hell he, she, or they wants.
The so called 'hard determinist' is simple an incompatibilist.
The compatiblist accepts both determinism and free will. The compatibilist says that given antecedents x and y, a person WILL (but not MUST!) do z. Could he have done differently? Certainly. But to actually have done differently, antecedents would have been different.
There lies the sticking point. Given determinism, the antecedents cannot be different. As the antecedents cannot be different, there are no alternate actions within such a system.
Where without the possibility of alternate actions, there is no choice. Which means that each and every decision that is made is inevitable. That each and every action that happens is inevitable, fixed by antecedents that could possibly have been different.
Hope that helps. Not holding my breath.