The article is about writers, not regular people. It's explicitly directed at people trying to make a living writing.

We found it because of HN, but his audience - the only one's who's opinion he should give a shit about - are his readers, who presumably know him because of his (according to the article) Raymond Chandler-influenced sci fi. I'm willing to bet those people are not put off by some swearing. :-)

If you are trying to make a living writing you should a) be fucking reading and b) appreciate all the wild and wonderful facets of language.. like using a good cuss word for deliberately over the top emphasis.