Criminality may be open to interpretation depending on the country. For example, the Federal Law in Mexico establishes the age of 12 as the minimum age of consent, whereas in the USA the age of consent is set between 16 and 18 in all U.S. states. What is considered criminal in the USA may not be criminal in Mexico or other countries where the age of consent is lower. In the Muslim world, Aisha was six or seven years old when she was betrothed to Muhammad and nine when the marriage was consummated. So, the Cardinal could be correctly suggesting that since laws regarding child abuse can be open to interpretation depending on the laws of a particular country, he is calling it an illness so that it can be treated as an illness too, without interpretation to law since child abuse is a global problem.
I feel that child abuse is most definitely an illness and disease, as well as morally repugnant and criminal, and people who abuse children need to be treated with any tools available, whether it be meds, therapy, possible castration, societal exclusion, etc. or a combination of these things.
Since different countries have different laws, I think it is a good idea to treat child abuse in a triune way-Criminally, Medically, and Morally. If we attack child abuse from all those angles, not just one or the other, there's a better chance that it can be treated and kept under control worldwide.
The Cardinal could have just kept his mouth shut and tried sweeping everything under the rug as some others have. I give him some credit for acknowledging that there is a problem to begin with. It may not appear to be much, but he is doing more than others in his position are doing (Or not doing).