This is what the pope was trying to imply;

The advent of condoms mean that more people go round having pre-marital sex, and more sex means more HIV transmission (since condoms aren't 100% safe).

i.e. condoms increases the risk of HIV.

But it came across as though he was saying that you there's no point using condoms, which is sooooo irresponsible considering the number who hang on his every word.