Exchanging a larger number of deaths of civilians for a smaller number of civil worker deaths is a good trade. Dead civil workers mean less people willing to do that work, which means less help available to people overall.
I think your sentence is missing a "because" at the end. Why do you think that deaths are meaningless as an integer here but would be useful as a ratio? Usually I've heard this line by folks who want to minimize the perception of police killings.
* https://www.washingtonpost.com/graphics/investigations/polic...