The worst kind of evil is the kind in which people are willing to sacrifice their lives in order to kill others. There is nothing heroic about killing defenseless, unharmed people. It is like stabbing someone in the back and only cowards do that. They probably have been brainwashed to believe they are martyrs. Maybe they think they will be rewarded for their troubles in another life. They think they have won but all they have done is book their tickets to hell and they will not escape the judgment. Mankind think they are powerful but God has the final word.