To put this in perspective, from a Lutheran POV... If you really understood the price that Jesus payed for the salvation of a sinful world, why would you want to go and do something heinous and hard hearted like hurting children or innocent people? It's like crucifying Christ all over again. After all, Jesus came to end oppression and exploitation. To have faith in Christ means to have at least a little bit of loyalty to Christ and the things he loves, and it's difficult I think for most Lutherans to reconcile heinous criminal acts with the Holy Spirit working in someone's life. That doesn't mean it is impossible, but we would definitely encourage somebody like that to do some soul searching.
Good deeds are important... for the sake of our neighbor. But no good deeds pleasing to God are possible without in some way being illumined by the Holy Spirit. Traditionally, Christians understand that as being a consequence of having faith. Martin Luther said the faith that justifies us is a lively faith that does not cease doing good. hHat doesn't mean we live sinless lives, but it means we at least are oriented towards being something other than a horrible person. To quote a Buddhist proverb, once you have the antidote, you no longer need to drink more poison.