You're 100% correct. The thing is, we are not Vulcans. Sex isn't a logical act. The times where it is done with the purpose of producing a child are the minority. It's fun. People do it because it's fun, not because they want kids. It feels fantastic, but if you're a virgin (I mean no offense, if that's your decision that's cool with me) then you can't really know that. Unless you've had the safest sex of all, in which case you better go pray for forgiveness for that, too, but the truth is they can't compare. It's like a Happy Meal versus a five course meal prepared from scratch laid out on silver, with 50 year old wine.
Promoting waiting until you deal with the consequences, IE a baby, is not the same as promoting waiting until you're married. You can be emotionally mature enough to deal with a kid before you are married. What if you decide that your way of dealing with the consequences is to have an abortion? That's perfectly acceptable, However, with condoms, there's really no need to worry.
In school, health classes do not encourage you to become a doctor. Math classes do not encourage you to become a mathematician. Science classes do not encourage you to become a chemist and English classes do not encourage you to become a writer. They are things you MUST know in this world. What you do with the information you learn is your own business.
I don't think you ever answered my comprehension question :P