actually, swear, or vulgar (folk) words are just certain expressions used by common folk that were disliked by higher orders, and were therefore forbidden. And frankly, being punnished for use of certain words does make for a negative reaction upon hearing them. These taboos were removed with the downfall of aristocracy, enlightment and cancellation of villeinage, but the custom remained.
what I'm trying to prove here is, that there is no logical reason for vulgarisms to be forbidden to use nowadays, mainly since they are just words that were unfairly and forcefully removed from the colloquial language. In fact, there are many times when the use of a vulgarism is the only way to express a thought accurately.