These are typical responses, which lack any perspective on life and culture. At face value, child pornography is not necessarily bad, child pornography is not necessarily damaging and child sex does not need to be a bad thing.
Damage comes from rape, violence and emotional abuse (which is the worst because it lasts).
But these things are not inherent to child pornography and very common outside child pornography. The argument is child pornography leads to damaging events. But it certainly isn't the source. People who do such things are usually emotionally disturbed themselves. And making child porn illegal is not going to change that (almost hard to believe it wasn't illegal not so long ago).
You might even have the same "make it illegal, it will become worse" effect as there is with drugs.
So, I guess there is no point to this post, but I do think it's wise to keep perspective on subjects. Even though everyone is inclined to err on the safe side, continuously making the safe side more extreme.