I was raised in a house that did not have any cussing (that i can remember) at the moment i dont even remember given a reason why we didnt use certain words, just that we didnt.
Then in college one of my professors (that often disccussed things that seemed unrelated to the subject at hand at first) got off on a tangent about cuss words (and censoring) :
What is offensive about a word? Is it the word itself, the sound, combination of letters? Or is it the meaning of the word? Or the emotion the word carries? Is it the intention that either party (person saying or hearing person perceives) of the word?
If you are offended when someone says (insert any cussword) are you less offended if the person is censored into saying (insert some word that is more "polite") if you knew they had wanted to use the former?
I believe this has been covered by a famous stand up comedian almost this exact stance.
But this bring up the heart of the matter. That expletives can be an attempt to convey emotion.
In person we are given the advantage of body language and voice tone and loudness to convey emotion. In the moment we may be overcome by emotion and use expletives, and describing a situation long after the fact when we are no longer emotionally overcome may wish to stress the emotional aspect of the details by using expetives.
Online (ignoring video and audio mediums) we do not have any non text ways to convey emotion. And the fastest, easiest way to convey just how much that primer scared you when it went off in the tube (made up situation) is to use some words that get changed to stars on this forum. Logically, there is no need to explain it. I think every one of us can imagine just how scary that would be. But we are not 100% emotional or logicall people, and the need to connect on multiple levels is real.
I have not lived long enough to know this, but i suspect our society has been on a path that has pushed emotional thought in front of logical thought. And with the rise of the internet and the limitations that it had early on, i believe this combination really pushed forth the common use of language that is supposed to be reserved for extremely intense moments and emotions. To the point where it no longer has the effect it once did.
I view this board as primarily drivin by facts and logic, and therefor it is quite easy to abide by the no profanity rule. But on occasion i have felt like my tools to convey a thought were significantly reduced.
Perhaps i have figured out on my own why my parents did not use foul language, it would certainly fall in line with how we were taught to value logic over emotion.
I also reject the motion that such language signals a lack of intellegence. I do believe that the levels of use that one can experience in otherwise normal situations signals societal level problems. I do not believe the natural evolution of language can adequately explain its prevalence.