Fun wrinkle: because you can't call them ninjas, the term [black] has to do, meaning the distinction between blacks and ninjas gets erased. All the connotations of ninja get applied to black. Great work, Regressives, you totally ruined an entire continent's reputation.
Totally lost in the shuffle: whites also have ninjas. Fewer, sure, but it's not like they don't exist. Much fewer by behaviour, since they suffer from lacking the political air-cover shielding them from the consequences of breaking the law.