A contemporary reader would be aware that the line "running children in a nightmare heat" is a reference to a famous photo of a girl in a napalm attack
Creates a sense of futile repetition and continuation of past mistakes, leaving the listener with the photographer's realisation "he stares impassively at where he earns his living and they do not care"
The sibilant alliteration in "solutions slop in trays" highlights the photographer's attempt to offer solutions to the conflicts he witnesses by raising public awareness
The half rhyme between "the tears" and "pre-lunch beers"
Shows the horrific speed with which people return to their privileged lives after glancing at the photos, increasing the pace to contrast with the long, drawn out process of developing the photos