Trouble is that it rebounds on T1s as well, as Northerner mentioned. This myth that T2 is self-inflicted is bad enough for T2s, but to the average punter in the street, there's no knowledge of diabetes, so T1 and T2 tend to get lumped together. So you get the effect that people think T1 is self-inflicted as well.
I think it all started because of the very obvious correlation between T2 and being overweight but rather than look at the pathways, people started thinking that one caused the other and unfortunately got them the wrong way around.
Incidentally, there seems to be some evidence that T1 is genetic in some cases. This would make sense being an autoimmune condition. Not in all cases, but there are some with a family history.
And MODY is quite definitively genetic of course.