I'm not sure I agree with you.
War isn't good for business like it used to be (unless you're in the war business itself, which is a relatively smaller portion of the economy these days than it used to be).
No, I believe Conservatives just like to accuse Liberals of cowardice. Its an effective way of insulting and discrediting your opponents in most cultures, although it should be obvious to even the most modest intellect that courage, or cowardice, have absolutely nothing to do with one's political convictions.