Re: the saying is there to explain ...
Well, indeed. But the saying is by itself useless, and since no other context was given, merely served to imply that Hancock's good intentions were only going to result in a malign outcome.
Of course, if your aim was merely to achieve some vacuous rhetorical impact, then keep up the good work. A couple of suggestions: you might also claim that Hancock's position "is untenable" without explaining why, or assert that you "refute" something or other without providing an actual refutation. These usually work pretty well.
But if you really want to demonstrate that such a negative outcome was probable, you actually have to analyse proposed solution(s), not merely trot out a well-worn phrase or two.