Well, I doubt any father of 10 or more kids was a Military Historian, or Genetic Biologist who take a futuristic guess and predict that in the next 100 yrs there 'will be Massive Wars', either this country's soil or somewhere else implying that at least 3 or 5 of their grandkids will die in War, or, alternatively a biological futuristic guess might forecast a massive plague, like another Black death, typhoid fever, malaria, or tuberculosis, or polio, diseases that could easily wipe out at least 10 more grandchildren or great-grandchildren.  So in anticipation of all these futuristic bleak times...you simply 'have to have alot of kids'...to they make it over the Goalpost of life's obstacles.