> Diabetes, I think in some cases restricting carbs can be fatal as diabetics can suffer from ketoacidosis, where the blood turns acidic due to an uncontrollable amount of ketones present.

Ketoacidosis is extremely dangerous for diabetics, but it occurs in cases of extreme high blood sugar, not low blood sugar. These ketones can lead to serious kidney damage, or even kidney failure. Your point about hypoglycemia is dead on though.

As a type I diabetic myself, carbs are actually life saving during a low blood sugar episode (and low blood sugars actually occur more often for type I diabetics with tight control). As an aside, I find it perpetually frustrating how keto-fans like the OP conflate type I and type II diabetes as if there is no difference (because the answer to everything is "keto" \s).