Falconfire
missmanners' favorite toy
Going to say it now I think its a tie between Barefoot Gen and Grave of the Fireflies if for no reason than they are both based explicitly on true events their creators experienced in WWII towards the end of the Pacific war. Its not even that I dont agree with the actions taken, since there are strong arguments to say the US was in its right both in the fire bombings and the atomic bombings, but seeing the toll it took on civilians and especially innocent children its absolutely horrifying.