Fait-divers: the massive web of probabilism

"behaviour is not specifically predictable from genes. The massive web of probabilism makes such prediction weak at best, just as we’ve seen for physical traits. Our mental activities feel as if they are free, and their unpredictability supports that feeling. But the reason is that the causation involved is so complex and deeply probabilistic that it is, in effect, unpredictable even if we were to try to enumerate all the contributing factors. In that sense, for all practical purposes, we are indeed free."