The purpose of a dictionary is to give the meanings and usage of words, not to tell people what words they may or may not use. It is descriptive, not prescriptive. In a any case, in many countries there are laws to stop people making racist comments on others.
Ex-FM Lieberman: Firebomb attack in Jerusalem a reminder that norm is Arab terror against Jews (Haar
from the article: Moves to censor the dictionary may not help fight anti-Semitism