In circumstances where Code Red is warranted, it is both rather difficult, and a waste of time better spent elsewhere, to try to coordinate two heads swiping at the same time. Consequently, you almost never see it being officially declared even during revolutions, confirmed nuke ops, etc. Also, since an official declaration isn't even a requirement to use "code red situation" as a justification for use of force purposes, the only practical benefit of the declaration is to give grey tiders a heads up that their actions will have consequences in light of the circumstances on the station. There is no reason to overcomplicate the process to make the declaration. This isn't realistically abusable when the Captain and HoS already have access to the armory, etc.