Because they are cowardly bastards that would rather slaughter defenseless children then act like real mean. A real man would have to face his foe and these guys would rather cover their faces and kill the kids of their so called enemies because they know children won't harm them back. There is no doubt in my mind that these men will pay for what they've done and I'm not talking about God, I'm talking about Karma. I don't know what will happen, but it will come back to them somehow, it has to.