Choosing not to use contraception isn't always an irrational decision. You can't possibly know how many people opposing contraception are making an irrational decision based on their view.
No, but if you have sex without the intent of reproducing and you don't use some form of contraception then I would consider that to be irrational.
Yes the Catholic Church are saying no contraception but they are also saying no sex out with marriage and only for reproduction. So the chance of STIs and unwanted pregnancies aren't there, which is what makes not using contraception irrational.
Really? Are you honestly that blind to how the world operates in reality?
I'm sorry, but no institution is going to tell me who I have sex with, when, where, in what position and with what contraception. To suggest that an instruction to not have sex is the solution for not using contraception is..... well, I just don't have any words.
Anyways I've already expressed that I find these old fashioned views, that society has moved on.
You seem to be living in a fantasy land where STDs, promiscuity and rape don't exist.
So you've never know of a rational person to end up doing something irrational?
Not without them being convinced of something without sufficient evidence, no.
To be clear, my issue on irrational choice is not exclusive to religion. It is any practice which results in belief in something without sufficient evidence. It just happens that religion is one of the most prominent phenomenons which results in this occurring.