In my opinion, should someone’s path to self-expression necessitate the use of swear words then so be it! Swearing is not something I commonly do in my writing, fiction or otherwise, not because of any disdain for the practice but because it is not something I use in my everyday vocabulary, nor has it been relevant to any character I have conceived of to date. I do believe, however, that as in any form of communication, in the course of putting down the bones of a thought, subject, situation it is wise to consider some variables. Is the swearing relevant to the writer and/or speaker (character or subject represented in the work), the internal and/or external context (the emotions represented or situation), and the audience (would adding swear words make communication with a specific audience more successful and/or effective). I think in any form of communication words should be considered carefully. Swear words, ideally, should not be looked upon as any lesser tool as long as their use enables us to successfully communicate.