There are many, many people who don't think that we're at war. With no news exposing our enemies true colors, support for the effort will fade, and America will go back to sleep.
Because our media outlets won't dry up, and they will NEVER let you see this. They want to show you America's evil, and that's all you'll get to see.
People can't deny the visceral image of a severed head, nor can they deny the evil of those that would kill an innocent man in cold blood while chanting religious slogans. People instinctively know evil like that when they see it.