The alleged incentive for restricting our vocabularies is most often the unfounded assertion that some people are "offended" by certain words. But why should words offend anyone? If what I say is untrue, it's humor and couldn't possibly offend you. If it's true and it offends you, it would seem you have a problem differentiating truth from fiction.
Offensive is a Perception Control word meaning "inconveniently true." If I say, "The average Asian IQ is two points higher than the average Caucasian IQ," most people just shrug and say, "Yeah, OK." But if I say, "The average Caucasian IQ is four point higher than the average African IQ," people start running in circles, waving their arms in the air, and shouting, "Ohmygod! Racism! Racism!"
Why? Both statements are true. Why is one "offensive" and the other not? It's because you have been taught to believe that the second fact is NOT true. When the fact is presented to you, you suffer cognitive dissonance – the reaction to a fact that contradicts your belief system. And you find that inconvenient.
So offense is having your belief system challenged by facts. If you're a Democrat, you're not offended when I say taxes are high. Nor would you be offended if I were to say that revenues are down. But if I said that revenues are down because taxes are high, you would come unglued. Not because what I said was untrue. In fact you refuse to evaluate the veracity of the statement. You react solely on the basis that it challenges your preconceptions.
Preconceptions serve a valuable purpose, of course, but facts must always trump them. That's the mechanism of intellectual evolution. So the next time you feel offended, look into your own mind and ask," Why do I find that offensive? What delusions am I harboring that make it difficult for me to accept the truth?" If you're offended by facts, there's something wrong with your thinking. The fault is never in the facts.
Offense can also be incited by invoking facts that we have suppressed. If I were to say that Barack Obama is a bastard, you might be offended. Not because it's not true. You know it's true. Everyone knows it's true. It's not his fault, of course, but it's still true. So why are you offended? Because you have chosen to ignore that fact, and my bringing it to your attention jolts you out of your comfortable denial into the harsh light of reality. And you find that inconvenient.
But ask yourself which attitude is more conducive to mental health, to accept all facts dispassionately, or to repress certain facts and refuse to consider them? If you are offended by something you know to be true, you have obviously chosen the second course.
So the next time someone is "offended" by something you've said, simply respond, "That's your fault, not mine. If you're harboring delusions that make it difficult for you to recognize the truth, that's something you're going to have to work out by yourself. I can't help you"