Japanese-Americans, referred to as Nikkei by Japan, underwent an extended detention in racial concentration camps. They were basically forced to abandon their Japanese culture and way of life to become “American,” punished when speaking Japanese etc. It’s totally within their rights to call the slur a slur, because it calls back to the internment camps.
Call me an anarkiddy all you want but I don’t think contributing to literal governmentware is a good idea