Opinion:
Total body count, but with two extra cells (as mentioned) to conform with facts and clarify it for the reader. I'm not on board with the FBI's "not including the shooter." Admittedly, if 50 bad guys were killed and only one innocent, including the bad guys could be confusing a gang shootout with what is intended as a mass shooting of innocents.
However, two extra cells would clarify that, avoid any challenges to your veracity, and still have the data conform to FBI standards.
Yes, there is such a thing as too much precision, but in the "two extra cells" case, the user of the data base could make up his own mind as to how to present it.
Opinions vary.
Re "precision," yes, 22/7 = pi, but you can't get pi=3.141592653589793 from 22/7ths. On the other hand, you can get 22/7ths from pi=3.141592653589793
So include the poopy-heads in extra cells, but allow the user to figure out how he (or she, talk about excessive precision), wants to present it.
Terry, 230RN
(Edited after the following post.)