 Why does swearing lose its power?
Blasphemy would be closer to it. Britain's great postwar drama critic was no fan of American football, but he was a fan of swearing. "I think there are very few rational people in this world to whom the word '[expletive]' is particularly diabolical or revolting or totally forbidden." Within 24 hours, resolutions had been introduced in the House of Commons calling for his prosecution on charges of obscenity, for his removal as a theater official, and for censure of the network for allowing an obscene word to go out on the airwaves. Swearing isn't the only public act that Western civilization condones today but didn't 30 years ago.
 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