The propriety of impropriety

Worthy of contemplation:

Go the fuck to sleep.

All women really want is a cup of fucking tea.

Considering these two examples yesterday at the airport, and considering the loud profanity I had uttered at quite an early hour in the morning (on dropping a box of asparagus seedlings), I couldn't help but come to the obvious conclusion: the thing is, inappropriate words are appropriate pretty much all the time.