I think that photos, which are intended to make a specific point, should not be uploaded to Wikipedia unless they have been previously published by a disinterested, reputable 3rd party. Flikr.com, weblogs, partisan political web sites (dailykos, freerepublic, etc) and such are not acceptable, but commercial news organizations and commericial publishers and to a lesser extent, non-profits would be ok. There is simply too much opportunity out there to stage photos, for example:
Supporters of Candidate A take Candidate B's signs and make a big mess in a parking lot with them and leave also a lot of trash like water bottles and sandwich wrappers.... the Wiki caption for this reads, "trash left behind after local rally for B". Clearly it's a staged photo intended to make a point. If the control parameter of "intended to make a point" is not enforced, the excuse regarding the above scenario would be "I found the trash & signs in the parking lot and merely snapped the photo". Such assertions could not be disproved, opening a pandora's box of scheming opporunities.
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