This has always been one of my biggest fears. People always assume diabetics need insulin, when in most cases of unconsciousness, insulin could be deadly.
I carry a note in my diabetes-bag with me (next to that glucagon-injection) saying: "Don't give me insulin. Ever!" I translate that to other languages when I travel abroad.
My biggest fear is to go out because of low sugar, then someone with good intentions killing me, for wanting to help me.