There are, or can be, technical/business process solutions to help in this situation, and the worldwide journalistic market is certainly wide enought to justify the effort. Just create a "Journalistic Integrity" version of Photoshop, which limits the manipulations that can be done on photographs in the field, plus logs the changes into the saved versions. Acceptable changes may be contrast, brightness, and maybe basic cropping. Every other manipulation would have to be the result of sending the image to an office at the newsroom, with a request of what to do, and it is done by someone other than the photographer, with the knowledge of the editor, again, with version control of what was done, along with what was requested.
Rather than making the "journalistic integrity" version of Photoshop be crippled, why not just have it tag the output with EXIF data that lists every alteration made? That, or maybe just a policy change in the news organization that requires originals be submitted along with any "improved" version.