 Why does swearing lose its power?
Swearing isn't the only public act that Western civilization condones today but didn't 30 years ago. But aside from a few exceptions, the supply of genuinely offensive language has dwindled almost to nothing as the 20th century comes to an end; the currency of swearing has been inflated to the brink of worthlessness. When almost anything can be said in public, profanity ceases to exist in any meaningful way at all. What is important is that profanity served a variety of purposes for a long time in Western culture.
 the ideas they represent are less taboo than they used to be
 kids are less scared of swearing than they used to be  as people get older, the words are easier to say  the ideas they represent are less taboo than they used to be  our culture has matured, making swearing unimportant