And I'm sure you've racked your brain thinking of things that could be done, and after exhaustively thinking about the options for such a long time, you finally concluded that there's no way.
No, you wouldn't just be going on presumption or anything.
Well, if someone were against the increasingly rapid advance of technology, he might be interested in sending mail bombs to prominent scientists. (Where have I heard that before?)
In the book, Kurzweil asserts that the only thing that could stop the Singularity is a worldwide totalitarian dictatorship. And I am most certainly against dictatorship.