Alas, I don’t have references with me any more, but I recall that very early in the Pacific War there were instances of American pilots in extremis intentionally ramming Japanese planes or (less sure on this) ships.
It’s certainly my recollection from much reading that the first ‘kamikaze’ pilots in the Pacific War, in the sense of intentionally sacrificing themselves by using their planes as weapons, were Americans.
Anyone who has been in a desperate fight for something very important could probably understand the willingness to sacrifice all, and much more so when imbued with America’s national spirit against Japan at the time.
The difference between the early few American ‘suicide’ pilots and the very much later and very many Japanese ‘suicide’ pilots (a surprising number of whom survived the war, which says so much about Japan’s war management), was that the American pilots seemed to be occasional individuals who had decided to give their all contrary to the general principles and orders governing their conduct, while the Japanese were trained for their tasks in accordance with Japan’s approach to the war who conformed with Japan’s general principles and conduct that everyone should give their all.
There isn’t anything conclusive to infer from these differences about the characteristics of Americans and Japanese at the time, particularly as America’s industrial might beat Japan, apart from wondering about the failure of the Japanese militarists’ spirit (‘Chi’ and its variants in Japan and Asia) which was supposed to overcome the effete Americans and their Western allies.