It follows an old US tradition of wars following "attacks" on ships.... like the USS Maine, the RMS Lusitania, Pearl Harbor, USS Maddox (Gulf of Tonkin incident)... am I missing any?
We just have to park some carriers real close to they can be attacked. Or even if they aren't attacked (like the Maine and the Maddox) and an accident happens, or someone gets jumpy, then its good enough for a war!