I don't do this for shock value (which has also been suggested by one particularly gnarly reviewer back in the day) but because it is my style. This is how I choose to write. I don't exactly sit down in front of my laptop and think 'what can I write that will shock people the most' but I do follow my writing instinct and admittedly, it sometimes takes me down a dark, twisted and even questionable road but one thing can be assured, I'm never bored. To me, this is a good sign. If the writer isn't bored, chances are good the reader won't be either.
The truth is that only in very extreme situations is a writer going 'too far'. There are 'how to' books out there that would make the most insensitive person a little ill 🤢and although there are some that definitely cross the line, for the most part, we have to consider freedom of expression. And the really beautiful thing about freedom is that it kind of goes both ways. I'm free to write what I want and you're free to not read it if you believe it's too offensive. 😉