I've just been reading Bill Kauffman's fine book Ain't My America: The Long, Noble History of Anti-War Conservatism and Middle-American Anti-Imperialism (see him talk about it here), and I ran across this quotation from Bill Clinton in 1997:
It's hard when you're not threatened by a foreign enemy to whip people up to a fever pitch of common, intense, sustained, disciplined endeavor.
Indeed it is. Outside of wartime it is difficult, even impossible, to rally millions of free citizens around a common aim. When you're not threatened by war or occupation, people have their own endeavors, their own purposes, their own "pursuits of industry and improvement," as Jefferson put it, to worry about. That's why collectivists and statists are always trying to gin up war fever in metaphorical wars like the War on Poverty, the War on Drugs, and the Energy Crisis.
And as I wrote recently in the Wall Street Journal, this martial spirit remains a temptation to our current candidates. Barack Obama told Wesleyan graduates that "our individual salvation depends on collective salvation." John McCain calls on us to serve "a national purpose that is greater than our individual interests," preferably by doing calisthenics in uniform in front of city hall. Politicians like that, as Michelle Obama, "will never allow you to go back to your lives as usual."