Cursing and swearing are in us.
That is perhaps what Janadas Devan was trying to say about how our ancestors acquired this gift from nature. And he has the internet to support his case with plenty of lurid examples, some carved to such refinement that they should be collected in a book and would probably become a best seller. And for those who find it impossible to quit, like smoking, fear not. And also do not despair. Just blame it on nature.