All the government has to do is take away your insulin and test strips, not your guns. Type 1 diabetics will start dropping like flies. Type 2s may following after a short time. But in a SHTF situation it is more likely starvation, lack of water, uncontrolled diabetes (due to lack of insulin and refrigeration), or all of these will lead to a slow painful death within a short period of time. There, does that make you feel any better?
Unless stockpile insulin from Wal-Mart and have a liquid gel cooler.