The real question would be, why do non-whites regard talking as the only form of communication that's truly worth making use of -- to the exclusion of all other pursuits, including intellectual introspection and respect for the privacy and personal space of others around them?
And the answer, I'm afraid, is that non-whites are too primitive to comprehend any pursuit above the level of verbal communication, which is probably why Africa is, even to this day, bereft of a coherent writing system, and relies on fire-dancing, cannibalism, and human sacrifice to express simplistic ideas.