Picking and stealing the best paintings from the Louvre requires real skill and artistic judgement (because I said best, not most popular). It's still stealing, and it doesn't make you an artist.
Photography is kind of in between. If you take a photo of a statue, you're basically saying "this statue looks interesting from this angle in this lighting with these camera setting". Well, it doesn't look that way by accident. It looks that way because somebody intentionally made it look that way. You get credit for picking the angle, but you don't get credit for the way the statue looks. Do the same thing with a sunset, and there's nobody else around to claim credit, so you get all of the credit by default.