One of the things that protects the wicked is the sheer mediocrity of the common man. He doesn't have the imagination to envision this kind of evil. He refuses to believe such things could be deliberate because he cannot conceive of such things or the purposeful concealment of these deeds.
There's an agenda there and the sheeple will always be subject to it as long as they lack the capacity to postulate the existence of humans who are not as pedestrian as themselves. There are ends of the spectrum where raw, satanic evil prospers because it remains difficult to believe in it.