It appears to be abandoned does not mean that it is. 

Also I doubt there are political reasons for its inclusion, source is  Boletín Oficial del Estado. 

In any case, if you are sure that the field is no longer in use (and very sure because as you say it is dangerous to circulate in a shooting range), it is not necessary to delete anything. You have other tags that can be useful (https://wiki.openstreetmap.org/wiki/Lifecycle_prefix) and there will always be a history of the use that the area has/had in the database.

Regards,

Jesús López
OpenStreetMap Foundation
Data Working Group