Just because a family doesn't have a history of juvenile diabetes doesn't mean it didn't exist or express. My family doesn't have a history of Arterio-venous Malformations but I sure as Hell got one!
You also have to take into consideration the Hardy-Weinberg Hypothesis in which 1.27% chance of mutation during Mitosis.
There is also the increase in asthma as well. it's pure numbers writ large.
Just because a family doesn't have a history of juvenile diabetes .... ... means that your previous "Darwinian society" statement is completely wrong. You should own up to your mistake, rather than trying to baffle us with BS.
If you're this wrong on diabetes, the rest of your opinions are not to be trusted, either.