The following homely, unoriginal, and obvious argument seems not be a hot part of current discussions, but I've just been struck by the obviousness of its soundness. Start with the following obvious fact:
- If I am to any degree responsible for a decision or mental state E, then either E is identical with or the result of a libertarian free choice by me, or E is at least in part the result of an earlier decision or distinct mental state for which I am to some degree responsible.
- I have made only many finitely many decisions and have had only finitely many distinct mental states.
- There in fact are no causal circles.