While i understand the "no" points of view, i dont accept some saying "it would be an insult" (to americans) to add them :Kamikazes did the ultimate sacrifice for their country and not adding them (for the previous reasons) would be an insult to Kamikazes memory.
Just remember we got far "worst" units represented ingame : ie the "Das Reich" : we got their vehicles/skins/markings ingame, though their actions during wwii are -by far- worst than Kamikazes. (check "ouradour-sur-glane" village for exemple).
Kamikazes gave their life for their country, when SS units slaughtered and went deep beyond the "normal" war boundaries.
If we follow the reasoning here, then all SS units paints/skins should be removed.
I think a Kamikaze plane is one of the tactics used in wwii to sink ships (47 Allied vessels, from PT boats to escort carriers, were sunk by kamikaze attacks, and about 300 damaged!).
Adding them is a way to honor them. Not adding because some find it "not politicaly correct" would be a deny to they existence, their courage, their sacrifice, and their memory.
It's just my opinion.