Habitat for Humanity Suffers from Many Thefts

I scan news sources on a daily basis looking for construction related thefts and security news. One recurring story I come across routinely involves Habitat for Humanity construction sites being burglarized and vandalized. Here are 3 different stories from Detroit, Buffalo, and Springfield Mass all within 2 weeks of each other.

Thieves steal plumbing equipment, electrical fixtures from Habitat for Humanity house under construction in Springfield
http://www.masslive.com/news/index.ssf/2009/07/thieves_steal_plumbing_equipme.html

Tools Stolen From Habitat for Humanity
http://www.wgrz.com/news/local/story.aspx?storyid=68240&provider=gnews

Assault leads Habitat to change worker policies
http://www.detnews.com/article/20090706/METRO01/907060321/1409/METRO/Assault-leads-Habitat-to-change-worker-policies

Why does Habitat suffer from so many thefts? Obviously they can’t afford to have round-the-clock security, but nearly all single family home construction projects operate with minimal security and it seems as if Habitat experiences a high level of thefts. Do thieves know Habitat jobsites have poor security and are easy targets? Or is it possible that local news sources focus on these stories because a nationwide organization of volunteers is being targeted, which makes the problem seem worse than it is? Either way, it seems Habitat for Humanity needs to work on their theft prevention policies.