The English language is perfectly adequate to express such things as disappointment, anger, humor, and amazement without the use of profanity. Language is a tool. It exists to help us understand each other. But when an entire society begins to substitute a handful of words for the otherwise rich variety of the English language, we all lose something. When an award-winning screenplay repeats the same word nearly 150 times, as Good Will Hunting did, it lessens the impact not only of that word, but of all the other words that surround it.
Profanity is a crutch.
It is a shortcut that may aid the lazy, but in the long run hinders rather than aids intelligent communication. We can swear off swearing right now.