You've been Overton'd, and you think that something that was sold to you is something that is spontaneous or natural.
People also have hundreds of photos of lattes, food, cats, their friends, and all kinds of other stuff that makes them happy.
Taking photos of yourself, on the other hand, just seems to me to be grossly narcissistic. Like, why have thousands of photos of yourself in your phone? Super weird IMO
Sometimes other people do genuinely want to see you in a photo. I like seeing my friends and family in pictures, and they like seeing me in pictures. You can take it to an extreme, but a lot of the, frankly, bordering on self-righteous conversation around selfies on HN tends to imply, intentionally or no, that any selfies == gross narcissism instead of, you know, a genuine way to connect to people in the present and to connect in with the past once you're a few years out.