because the major media companies don't really have an interest in reporting on what might be a fucked up situation.
http://tv.globalresearch.ca/2012/03/censored-fallujah-lost-generation
This is a documentary I've seen on the long term effects of various munitions that were used in Fallujah on the populace and their children.
the vimeo download link is on the page right below the imbedded youtube.com video
A few veterans were interviewed as well.
Ross Caputi starting at about 13 minutes into the video. You can find him in other videos with a google search.
Gerard Mathew at about 31min. mark. describes an health related issues after returning from a tour in Iraq.
I'm sure some here will attack the source(s).
I don't know of any other organization having produced a documentary on the subject though.
Even taken with a heavy dose of the "proverbial grain of salt" it raises questions that some people probably don't want answered even on the off chance that the answers won't be to their liking.