I agree, I was curious to see how you viewed it this way. There is always a time and a place for this kind of talk. My point is - It takes common sense to know when to use the profanities or when not to use it.
I rarely cuss myself though but I've been known to cuss when I accidentally hurt myself or with a good/close friend that knows me well enough.
While it may not be aimed at the intelligence issue to use the profanities but however, when one engages into that on an excessive basis - that can also hamper down the conversation.