Pretty much my goal is to reduce your arguments to their core, which is "The thought of people thinking children are sexually attractive repulses me, let's kill them because of how they feel and think, regardless of what they actually do" We have established that it is possible to legally download child porn in such a way that no information about the demand for child porn can be known, via use of private information retrieval in the Czech Republic. So it is theoretically quite possible to completely shoot down the "demand leads to supply" and "it is illegal" arguments. Numerous scientific studies have been done that shoot down the "child pornography viewing leads to pedophiles being more likely to molest" argument. So really you are simply left with the "These people think things I don't like, let's kill them!!!" argument.