mosherose –
where do you come to these funny conclusions? a generation or 2 ago there was not sophisticated technology like there is today, and children died very quickly and easily from the smallest virus/ flu. Ask your grandparents/anyone from that generation. My grandmother came from a family of 16 and 2 passed away very young. I’m sure there were many cases of tay-sachs and children died r”l yet they didn’t know what it was. I know of a couple that wasn’t checked before they got married because at that time it wasn’t so accepted especially in their circles. (pple were still against dor yeshorim) and unfortunately they had twins with tay-sachs that nebach passed away. A person has to do his hishtadlus and believe it’s all Hashem and that his hishtadlus has no power, that’s the test.