the MSM chose to portray the DC snipers as isolated lunatics
The elder of the two
just happened to be named "Mohammed." When the subject of homegrown terrorism came up (and still comes up), the MSM dodged the Islamic angle and turned instead to "Christian" terrorists like Timothy McVeigh. (McVeigh was at best an agnostic concerning the afterlife, which disqualifies him from being a Christian.)
American Terrorist by Dan Herbeck may help to shed some light on that.
With the news that so many mosques in America are funded with Wahabbist money, the idea of "homegrown" terrorism takes on a far more sinister shape. These terrorists are better funded, better organized, and more ideologically driven than Mohammed and Malvo could have dreamed to be.