Consider this: having worked within the U.S. Indian Health Service I have noticed quite a reluctance among many Native Americans to accept the contraceptive handouts so easily offered by physicians. My theory is that the American Indians instinctively shun what they could perceive as a method of finishing the job that guns and greed didn't finish. Then again, look at countries like Japan or Holland or many others who have a good start on wiping themselves out. Besides these, there are other arguments to show that McCormick's mere authoritarianism theory is wrong (see the article of Richard A. McCormick, "'Humanae Vitae' 25 Years Later", America Magazine, July 17, 1993:
http://www.americamagazine.org/content/article.cfm?article_id=10960 ).
Like a mother instructing a child, the Church has a reason behind the command. That McCormick couldn't see this despite his great brilliance is a matter for examination and wonder; however, he is obviously not alone in his position. Does this mean that sometimes time and distance or special insight or special graces are called for? Also note, it is possible to assent to the pronouncements of the Church without understanding the reasons but that is maybe not what many professional theologians choose to do from having an ethos of having to grasp all the reasons. Others perhaps make their choices from more practical reasons out of their lived experiences.
J--