Then we agree on the final conclusion, but I do not agree with referring to emotions and morals for arguments like these. If you argue that emotions are valid in propelling an argument, then the comparison to homosexuals is legitimate: a 100 years ago there was emotional dissent against homosexuality.
The point is that emotional and moral arguments are inconsistent. We should be thinking about a logical legal system that maintains liberty, rather than thinking about what is "wrong" or "right," because no one has The Book that says all on that.
But isn't this where it all stems from? Our human compassion and morality? Without our emotions. Without our emotional attachment to the declaration of human rights that effectively forms the basis of our laws, then why are we arguing the point?
It is from these emotions that we feel sympathy for the abused child and that we feel disgust towards those in society who would take pleasure from such acts - and - moving on those emotions, we act. We make the laws that see them rehabilitated.
It is with our emotions that we form the basis of our logical arguments. The two go hand in hand, in this debate anyway. What causes you to see the wrong in child pornography? It is your compassion for your fellow man. It is the emotion that you feel in seeing the innocence stripped away against a child's will.
The emotional dissent towards homosexuals in centuries past was a xenophobic fear. It was more of a "we don't understand it and because of that it must be terribly wrong so let's quash it out now". In this day and age we understand the attraction between grown adults and children to be morally defunct and unconscionable. As a society, we have learnt that two consenting males/females can have those feelings for each other. But what chance does a child have? And we feel pity, and we feel anger, and it is our emotions that rule our decision to stamp out child pornography.
So, yes, emotions have their place in this argument. They're the very reason why we're having it in the first place.