No one dies from insulin? If you take insulin your body slows the amount of insulin it produces. It can lead to diabetes and diabetic shock. It's also bad for the heart. Most diabetics die from a heart attack.
I could write a few pages on this, but insulin doesn't kill acutely. It can, but rarely does so in "recreational" use.
Insulin use doesn't damage the natural insulin production, in fact can protect the pancreas of PED using bodybuilders.
Diabetics suffer cardiovascular problems but not because of the insulin they take. It's sugar that's the culprit among other things, there are a lot of systems malfunctioning in diabetics and there are several types of diabetes as well, not just the 2 common ones.
When "they" talk about insulin killing athletes they usually mean ODing acutely... very rare.
There is one compound that does cause diabetes in bodybuilders: growth hormone. Many bodybuilders are type 2 due to gh.