It's part of history, there is no reason at all for them not to be included. We talk about the 2 atomic weapons used in the war, the delivering aircraft, all kinds of stuff like that, so talking about a number of guys who decided to fly there planes into ships certainly shouldn't be excluded from any medium, UN or otherwise. All aspects of warfare are terrible, but none should be off limits in any setting, even among the UN World Heritage center, at least IMO.
I would be interested myself to read their final thoughts, to see what compelled them to volunteer for such missions, or if drafted for them, how they felt about it, going to certain fate. I was just reading a book by a very well known aviation author, Walter J Boyne, that had interesting information about the Kamikaze's - I had really had no idea about the effectiveness they had until I read this information.