It is perfectly legitimate for you to defend censorship of kiddie porn while rejecting censorship of other material, but censorship is still censorship. Remember that everyone who advocates censorship thinks there's a really, really good reason for it.
Of course, I recognize the inconvenience of admitting that censorship of which you approve is really censorship. That would mean that you couldn't engage in easy blanket condemnations of censorship, but would actually have to debate the issue of where the line is to be drawn between acceptable and unacceptable censorship.