Oh dear and here's me thinking it started when some vile, cave-dwelling nutcase murdered 3000 people in New York. I think you'll find that the west does actually quite like peace and compared to other parts of the world, like say the middle-east, is a lot more peaceful. You're right to point out that we don't like losing wars though - we prefer winning them which is why we usually do in the end.
Besides, even if all that (along with other western ideas like democracy, freedom of speech, freedom of religion, human rights and minor little things like that) is ignored and the west actually was the mercenary sociopath some people claim it is war still wouldn't be the result. Peace is more profitable than war.
The idea that all IS wants is peace and trade is, to be very polite to manoz, not very plausible.