While we're on the subject of "under-counting", there is no official count of the number of civilians killed during the US Gov's invasion of Iraq. No sense counting what you don't want to know and don't want to be accounted for? US voters / citizens certainly don't care.
Independent sources put it at 100,000+. I've randomly read 2x to 3x that but 100k+ is bad enough.
https://watson.brown.edu/costsofwar/costs/human/civilians/ir...