Illegal immigrants started nearly 40 percent of human-caused wildfires along the Arizona and Mexico border between 2006 and 2010, according to a new government report that backs up claims state lawmakers made during this year’s catastrophic blazes. That number even may be understated - the report by the Government Accountability Office said federal land agencies often violate their own policies by not trying to investigate the origins of such fires. Of the 422 human-caused fires, just 77 were investigated, and of those 30 were found to have been ignited by illegal border crosses. Illegal immigration also makes battling the fires...