I believe that very first photo has been proven to be a posed photograph ....
pictures do tell a thousand words, but even so, it may not be the complete "truth" eh ....
another famous one would be the infamous vietnam war street execution

that became a favourite of american peaceniks, but do people know that the executed vietcong officer was actually a blood-thirsty commie cadre responsible for killing a bunch of south vietnamese civilians ? go google for that story, ... in any other case it would have been justice, but framed this way, it becomes a political tool, eh ...
I think we should all learn to look beyond the superficial emotions that certain pictures invoke ....