It's crucial to recognize that historical and cultural sites often have names in multiple languages, reflecting the heritage and the diverse audience they attract. 

The General Secretariat of the Shiite Holy Shrines in Iraq, as an official government entity, provides documentation that is significant not just for tourists but also for cultural and historical reference. The inclusion of names in Persian (Farsi) for these sites in their publications is a clear indication of the site’s significance to Persian-speaking visitors and the historical ties between the site and Persian culture.

The principle of inclusivity within OSM allows for the representation of this cultural diversity. While physical signage is a direct method of verification, official publications by recognized authorities should also be considered valid sources for names in multiple languages, especially for sites with historical and cultural significance. 

Your concern about the potential for arbitrary renaming by unofficial entities is valid. However, in this case, the source cited is an official body responsible for the management and promotion of these sites. This distinguishes it from hypothetical cases of unauthorized entities attempting to rename locations.

Moreover, the presence of English names alongside Arabic ones in OSM for these sites suggests a precedent for including names in languages that serve the site’s visitors, even if those names might not be physically inscribed at the site. The goal of OSM should be to serve as a comprehensive, accessible, and inclusive resource that acknowledges the multifaceted identities of places, especially those of historical and cultural import.

Please understand that we volunteers who only do some edits in our spare time. I'm done discussing the obvious with you. I have provided all the evidence (that every rational person can understands) supporting the use of multilingual tags in historical and tourist places. If you wish, you can make a report to DWG, and let them decide whether your deleting of name:fa tags is a vandalism or not.