Child Pornography laws are there to protect real children. Your beef is with "Obscenity" laws. Obscenity laws, while originally intended to prevent the PUBLIC display of material and behavior inappropriate for young people, have morphed (in many places) to be thought-crime laws. THESE are the bad ones.
Actually, if the guy in the article was prosecuted under CP for the cartoons on at least one count. So, this is an expansion in the WITCH HUNT.