Hence my qualification of 'justified'. There have been dozens of times since WW2 where the US has incorrectly justified violence for economic benefit, and these instances are deeply wrong, and I wish they had not happened. But in certain situations where are freedoms are in jeoprody, it is ignorant to say that force could not be justified. Does this happen often? No. But when it does, it must be done well, and hopefully with as little bloodshed as war necessitates.