swansonj
Guru
The argument "you ought to be able to express yourself without swearing if you are competent with the English language" doesn't work. We could all express ourselves, in plain, factual, boring, unadorned language, with no swearing, but also no poetry, and the language would be vastly the poorer for it. The skill of using language is partly to evoke an emotion, a reaction, in your hearer. Use of anything from a Rowan-Atkinson-esque "pah!" to a "daffodil" is one of the tools in the armoury of language, to be judged by its effectiveness in the context in which you are communicating.