Well I'd imagine a lot of Catholics would argue that it is a sin to use one.
Well, they don't try that **** in the West. They go to Sub-Saharan Africa and tell people with no access to sensible sex-ed ignorant **** about condoms.
I think this is just an issue of complacency. When there is a media blitz around a disease, it seems to drop because people take not, but then a few years later rates in a particular disease can rise because the information and warnings aren't as common.
I think that was true with HIV/AIDS initially. At least here in Aus. We had a pretty pro safe-sex campagin in the 80s (opposed by many socially conservative lunatics) which helped decrease the rate of infection. Recently, I read rates are starting to rise again.