Oldcelt, Your logic is reasonable, but not fully informed. Here’s some reading on the topic (and not hardly from any catholic agenda driven source!).
pages.uwc.edu/keith.montgomery/Demotrans/demtran.htm
Explosive population growth of the last few centuries has to do with societies in transition from pre-industrial rural societies to mature industrialized societies. Even without modern contraception in the mix (i.e. data from before the pill or latex) show that mature industrialized urban populations do NOT have high population growth rates. Only those societies in transition do.
The solution to explosive population growth is NOT to throw condoms and pills at poor people, it is to assist them in achieving stable industrialized economies.
Ironically, the contraception solution will ultimately cost humanity dearly. Not only is it not necessary in mature urban industrial societies, it devolves them to the point of BELOW replacement fertility (not to mention the dehumanizing effects of separating the body-soul link of human sexuality). Look up the CIA world factbook online for “Total Fertility Rates.” A value of 2.1 is break-even long term population. Not ONE mature industrialized nation on earth in which contraception is widely available and socially respectable has a TFR above replacement rate. They average about 1.7, which is about a 200 year population half life (and a brutal economic climate along the way).
It turns out that God was pretty smart after all. Human sexuality is designed for stable populations within stable cultures. It’s only when cultural upheavals come along or artificial modifications to human nature become the norm that populations get out of balance.