Now hear me out, then blast away...
As the ICA and RSA begin to liberate the Inquisition's concentration camps, it would be very valuable if they could create a photographic record. Telling people of the atrocities is one thing, but for the general population to actually see pictures of men, women and especially children under those conditions would go a long way to undermining the church's moral authority, and getting people to question how righteous the cause truly is. A picture is worth a thousand words.
This evidence would also be useful in the prosecution of war criminals once the dust settles.
Thinking more long term, once photographic technology becomes more widespread, the population will come to accept it and begin to understand that photos = reality (as long as they don't invent Photoshop I guess

I think this would make acceptance of the truth much easier... I want to hear what you guys think!