Some people are most offended by the child rape, others by the animal cruelty, but I would remind everybody that these people are baring their souls here, and while we certainly don't have to condone what they have done, a supportive attitude might help them heal.
Something like "that's really low, but I am glad that it is the worst thing you have done - I bet that you have suffered a lot because you did that - what can you do to try to heal? Educate young people about date rape? Save animals destined for death in shelters? "
I would remind everyone here that a large portion of (admittedly brainwashed) people in the world would condemn all of us for using chemicals that they don't approve of. For some of them, their post would be "I smoked marijuana once and felt guilty for years afterward" or something equally ridiculous to us. They may be brainwashed, but they are people, too, and their views count (as unfortunate as that may seem).
Since I am a vegetarian who eats no animal products, I could look at the people pointing fingers at the person who slit a kitten's throat (yes, I was momentarily repulsed) and ask how many cows, pigs, chickens, and fish they have caused to be killed in the past month, and how many they caused to be tortured in factory farms for their milk and eggs. But I don't think that we are here to point the finger. Just as I can understand that people who eat animals aren't bad people (though I don't condone what they do), let's all try to understand that the child rapists and animal torturers are unquestionably suffering because of what they have done, and that having done something once (or even many times, in the past) that is very low down on our personal lists doesn't mean that they are bad people - they were just ignorant, and they are learning (like we all are). They are, after all, "confessing" in public, which is one way of attempting to heal. Let's be good listeners and as supportive as possible, rather than cursing them with death threats.