Also, I can't speak for the author, but I certainly don't think you should feel guilty about having a mind control fetish, given that I have one too.* It's just that this story explores what someone using that would actually be like in real life, which is by nature going to be...ethically dicey.
And there are a few endings where you hypnotize people that end on an upbeat, or semi-upbeat note- they're just somewhat harder to find.
*Well, assuming you haven't tried to brainwash or trick an unconsenting victim. But I don't think mind control like this is really possible, so it's a moot point.