Me! I worked most of my life with 3D and Photoshop. Some stuff i did might have increased some sales, some might have been fun, but all were useless and mostly advertisement. I always wondered, if everyone working in ads died, what effect would it have on humanity? Rich people would be worse, but humanity as a whole would be better.

That's just my field. I can think of quite a few areas that are just harmful and exists mostly to make rich richer.