The cliff is definitely an example in your favour. Have you noticed that weird urge to jump when you stand at a high place?
But the point remains, I have no desire at all to shoot myself. But I have the ability to. So therefore I have the choice to do so or not, and I choose not to based on my lack of desire.
It is also interesting that you believe in fate, considering your tendency to over think things scientifically (no offence intended).
The ideas of other people are certainly interesting.