If there was ever a shortage of insulin for a couple of days,
or if the family couldn't afford it (it must be expensive)
this little girl would die. Without expensive and invasive medical intervention,
this little girl would be dead.
There is not much worse than that!

Modern medicine is certainly MUCH MUCH better at treating a case of measles or mumps. Heck, I never even went to see a doctor when I had both of those because they are not serious unless the person is malnourished or drinking contaminated water.

And the person who is malnourished or living without sanitation,
certainly can't afford to buy insulin every day or pay for the expensive medical treatment needed to save their lives from diabetes when they first get ill and are trying to figure out what is happening.