If you step back for a second, you are claiming that billions of people are insane.

Taking a singular, highly-specific (in the context of humanity and for the thousands of years that Catholicism has existed) issue and conflating it to insanity or sanity is, perhaps, insane in of itself.

In the long run, culture like genes is to a large degree spread by reproductive success. Religions/belief systems that discourage reproduction eventually die out to be replaced by those that encourage it. All liberal/secular cultures currently have below-replacement birthrates, and hence will eventually be replaced by less liberal ones. So by the raw logic of evolution, it's very sane for religions to discourage lifestyles that lead to less childbirth, as to prolong their lifespan they need their adherents to keep having more children than adherents of competing ideologies.