Aharbi, I do see your point. And whilst I could never try to say that I don't swear, I do. Either appropriately (like accidentally sticking a screwdriver into your leg), or in situations where I know others aren't offended by it.
Whilst his character uses far too much profanity and is even too much for me, that's why I find it funny - it's all about the absurdity and incongruity of it for the Dr who character.