With regard to the precise effects of euphemism on human behavior, I have nothing to say. That it contributes to the proliferation of arrogance, however, is almost certainly the case.
Consider, by way of example, a reality in which one must announce his or her intentions of visiting the toilet. “I feel the need,” one might say under such circumstances, “to produce organic waste from one or more of my holes.”
What does one learn from this brief thought experiment? Among other things, how difficult it is to preserve the illusion of one’s superiority while also referring to his own gastric debris.