You can't say the method is impossible to us , and in the same paragraph cite an example of our doing exactly that.
Al Quieda killed almost three times as many people in the 9-11 attack as the Japaneese did at the Pearl Harbor attack. There is a real need to kill Al Queda and their allies untill they surrender or get broken enough that a repeat performance is unlikely.
Frankly I think that something less than killing all of the men of a nation might be sufficient to engender democracy.
Do you really think that nothing less would work?