"I'm British and I think that swearing enriches language when used judiciously."
It does. But "My political opponents are [swear word]" is not judicious. (Or profanity if you prefer; most Americans would not call "turd" a swear word but it is obviously merely a more genteel way of calling someone a shit, it is a low-grade profanity.)
It's very common and hardly new. It may even be tactically or strategically sound for some desired goals. But it's not judicious, having the same root as judge, being similar to magisterial. Dignified, mature magistrates do not say "People who disagree with me are poo poo heads." If they are inclined to fling insults, they usually use a much higher grade. See, for instance: http://allowe.com/laughs/book/When%20Insults%20Had%20Class.h...