And the list goes on and on. I'm sure that you would appreciate some of these photographer and their works, and perhaps not others. Some (Minor White springs to mind) have also written very eloquently about photography, and are worth reading. To me, it would be very easy to assemble a collection of images that I would truly consider art. And I imagine that most photographers of my (general) age could do the same.
Whether something is art or not is a dualistic concept that doesn't apply to most situations. Everything we make or create has some degree or component of artistic creativity, and most works that are considered to be pure art actually rely in part upon essential ingredients that are not considered to be art, such as factory-produced canvas, paint, brushes, easels and picture frames, and sometimes spectacles if the painter is longsighted.
Marton's point that photography is nothing more than a click of a button, is a flawed concept. The only images I've taken which I might describe as 'no more than a click of a button' are those occasional shots that I've accidentally taken whilst trekking along a rough path, by unintentionally hitting the shutter button on a camera which is slung around my shoulder and bouncing around as I walk. The result is usually an out-of-focus shot of a patch of earth or grass, with perhaps half a foot intruding into the scene. Some folks might consider such shots to be quite 'arty'.
Generally, even the most basic photography will involve more than merely pressing the button. It will involve a choice of perspective, decisions as to what to include and exclude in the scene through cropping and choice of lens focal length, what to emphasise in the scene through choice of aperture and selection of focussing point, and choice of exposure in accordance with one's visualization of the scene (is detail in the shadows more important than a correctly exposed, but uninteresting sky, for example, or vice versa), and so on.
After having captured the scene in all the detail one's camera can muster, shooting in RAW mode if one is serious, one can then continue developing one's original visualization of the scene through further adjustments in Photoshop, just as Leonardo da Vinci modified his original painting of the Mona Lisa by painting over his first interpretation.
The question is not, "Is Photography art?", but to what degree is photography art, or to what degree
can photography be art? Other questions that might be relevant are, "Is painting, on average, a higher form of art than photography is, on average?"
For example, I think most people interested in classical music would consider that opera is the highest form of art because it includes so many different genres of artistic endeavour combined into one show. It includes singing, acting, and the music from perhaps as many as a hundred individual musicians, as well as the artistic endeavours of costume designers and stage designers. Wow!