Never mind the manipulations which can occur even before the shutter is ever pressed— I'm having troubling finding links now, but I know there was controversy a few years ago about a picture of bombing rubble with an object (a dress form or something, maybe?) standing up in the middle of it, apparently by chance which created a very artistic contrast, but there were later questions about whether the photographer had in fact arranged the object in that way rather than discovering and capturing a preexisting scene.

EDIT: Still can't find it, but here's a list which includes a number of other wartime photos which are proven or suspected to have been staged in various ways: https://militaryhistorynow.com/2015/09/25/famous-fakes-10-ce...