In honestly though, you're not wrong. Richard Stallman has his controversial stance on child porn as well and I tend to agree with him. It is really really bizarre that modern western society doesn't seem to have a problem with video of soldiers shooting up little kids in Baghdad, yet a picture of a teenager showing her breasts to her boyfriend via text is instant grounds for being locked up (in Australia there is a zero tolerance police and teenagers have gone to jail and are on sex offender registries for just that; although their sex offender databases are confidential and not as fucked up as America's).
However, sexual assault on children is a heinous crime. It's sad and destroys the lives of kids who parents hope to keep from getting tainted by the world as long as possible. It's not unjustified to hate this crime to the degree which it is, but it's also kinda bizarre we don't treat videos of kids getting shot the same way. People get off on that stuff too; sexually.
What's even more interesting about this case is that the police knew CP was downloaded from his IP address. That might because the United States has mandatory ISP reporting, or potentially his IP was found on a raided website:
I'm more interested in how that information was obtained, and whether that process involved violating the rights of individuals of people not associated at all with any crimes.