Writing is an activity where matters from one's deepest interior are communicated directly to the outside without being completely processed by the conscious mind. The weaving of stories or essays by a writer and of paranoid fantasies by a schizophrenic have much in common. Writing is a compulsive activity and no-one can fully explain his reasons for doing it. Here are some possibilities. Defiance Writing is an act of defiance, of people who think you can't or don't want you to.
Writing is always inconvenient to somebody.
The fact of the writing itself frequently unsettles people even if they haven't read it. Even when the reader agrees with the underlying statement, he may feel it was better left unsaid. Since daily life involves a substantial web of consensual deceptions, clear, logical writing may expose commonly held falsehoods in an inconvenient way. Whether or not he understands the reference is to him, you have won. When an essay of mine is distributed on the Internet and I get sincere but very upset email from someone who spent a lot of time thinking about it, I feel I have done well.