Full Idea
To threaten morality Nietzsche needed to show not only that free will was an illusion, but also that no other distinction between voluntary and involuntary action (Aristotle's, for instance) would do instead. He seems to be wrong about this.
Gist of Idea
Nietzsche failed to see that moral actions can be voluntary without free will
Source
comment on Friedrich Nietzsche (Works (refs to 8 vol Colli and Montinari) [1885], 7) by Philippa Foot - Natural Goodness
Book Reference
Foot,Philippa: 'Natural Goodness' [OUP 2003], p.104
A Reaction
Just the idea I have been seeking! There is no free will, so in what way are we responsible? Simple: we are responsible for any act which can be shown to be voluntary. It can't just be any action we fully caused, because of accidents.