In totalitarian regimes—communism, fascism, religious fundamentalism—popular support is a given. You can start wars, you can prolong them, you can put anyone in uniform for any length of time without ever having to worry about the slightest political backlash. In a democracy, the polar opposite is true. Public support must be husbanded as a finite national resource. It must be spent wisely, sparingly, and with the greatest return on your investment. America is especially sensitive to war weariness, and nothing brings on a backlash like the perception of defeat.
