Adding to my previous comment, to explain the point about stones more fully:
I understand libertarian free will to mean, “the ability to make choices, in such a way that those choices are not completely deterministic in advance.”
We know from experience that people have the ability to make choices. We do not know from experience if they are deterministic in advance or not. And personally I do not know or care.
Your objection about the second part seems to be, “if the second part of the definition is satisfied, but only by reason of something which also exists in stones, that says nothing special about people.”
I agree, it says nothing special about people. That does not prevent the definition from being satisfied. And it is not satisfied by stones, since stones do not have the first part, whether or not they have the second.
Adding to my previous comment, to explain the point about stones more fully:
I understand libertarian free will to mean, “the ability to make choices, in such a way that those choices are not completely deterministic in advance.”
We know from experience that people have the ability to make choices. We do not know from experience if they are deterministic in advance or not. And personally I do not know or care.
Your objection about the second part seems to be, “if the second part of the definition is satisfied, but only by reason of something which also exists in stones, that says nothing special about people.”
I agree, it says nothing special about people. That does not prevent the definition from being satisfied. And it is not satisfied by stones, since stones do not have the first part, whether or not they have the second.