Suppose you were a skilled hypnotist, and so charismatic that you knew you could change the opinion of an average person simply by your choice of words. Would it be ethical to be that persuasive?
To make it interesting, let's say you believe in the rightness of your own views, and you are talking to someone who firmly believes the opposite. You both have the same information at your disposal, so it is simply a case of different opinions. If you knew you could sway that person with your words, without adding any new information to the mix, would it be ethical to do so?
I encountered this dilemma after learning hypnosis. You can extend the methods of hypnosis into normal conversation, the way a trial lawyer, politician, or top salesperson would. You can't turn anyone into a zombie slave, but obviously a skilled salesperson can close more deals than an unskilled one. Your choice of words has a huge impact on how other people form their so-called opinions. Where do you draw the line between a normal exchange of views and an outright manipulation of another person's brain?
Long time readers of this blog know that I view humans as moist robots who have no free will, and therefore morality is an irrational concept. But most of you disagree with that view, so for you this is a fair question.
Allow me to put it into concrete terms. Suppose I knew that I could use my powers of hypnotic persuasion, in the form of common words in this blog, to cause some portion of you to change your vote in the upcoming election. And suppose I believed I was helping the country by doing so. Would it be ethical to change people's opinions without adding any data to the process?