Not always. Sometimes it is a Mohammed, Hajji, or Jihad. Or an official saying "no indication that it is terrorism related". Or more rarely, something obviously Hispanic. But more often than not, your reading will be correct. And so will the assumption.
But I don't see a basis for a no need to look. Funk metal isn't rap.
If there is a story about a serial killer, do they say, "non need to look," (It's a white person.).