> I don't see any problem with backing abstinence as the proper form for premarital birth control, denying it in all situations mean those who fail to maintain abstinence won't feel social pressure to use birth control, and, guessing, there will be a lower likelihood of easy access birth control.

I'm not a catholic, but you have to try to see it from their perspective. What kind of moral leader are you, if you say "don't sin, but if you're going to sin anyway, here's the best way to do it"?

To draw a parallel: Suicide is very very wrong. But doing it wrong will put you in a lot of pain and might handicap you - so we should make small pamphlets for teenagers saying "don't kill yourself - but here are some tips if you're going to anyway".

For someone who's not opposed to premarital sex or contraception, it's an unreasonably far stretch to compare - but I'm not at all sure that's not pretty much how they feel about it.