Your point about the need for case-insensitivity is well-taken. Perhaps you ought to send a patch to Abigail (who now maintains the module).
As for eliciting a sigh, don't sweat it. There's absolutely nothing wrong with pointing out inadequacies in my work -- in fact, I always appreciate it. Just don't write off an entire module because of a small bug, eh?
And yes, the magic that allows a non-profane regex to match profanity is just rot13'ing.
With regard to the topic of this thread, when it comes to coarse language, I try to follow Oscar Wilde's dictum: "A true gentleman is one who is never unintentionally rude". I cannot know who will read my public messages (or my code), so I find it appropriate to avoid profanity, lest I inadvertently offend someone.
I would rather forgo that small element of my freedom of expression, so as not to infringe upon the community's collective right to comfort. To me, swearing in a public forum is like smoking in an enclosed space, or passing wind in an elevator, or playing a Mariah Carey song out loud. One person's valid form of self-expression is another person's unprovoked assault.
No individual "freedom" is ever absolute. It must always be weighed against the public good. And it's hard to see how this community benefits by front-paging profanity.
Besides, I find it very rare that profanity adds vigour or weight to an argument. Indeed, I usually discount any message that contains crudity ipso facto. And in my own messages, I would rather write well and argue cogently than resort to the convenient bludgeon of rough language.