As protomyth notes, by your rationale neither does law enforcement, public education or firefighting, but I'll add that the same rationale also argues for exclu

As protomyth notes, by your rationale neither does law enforcement, public education or firefighting, but I'll add that the same rationale also argues for exclusion of anyone working for a non-profit (and indeed, at least the public sector ideally creates an environment in which wealth creation can exist, while charity consumes wealth). Given that these are employment figures, it's odd to segregate one career from all the others.