Crown Heights and the Practice of Lubavitch Communities Worldwide
Crown Heights is the center of Lubavitch life and receives Anash, bochurim, families, and guests from communities around the world. Public practice here is seen far beyond the neighborhood, especially by visitors who come from places where a local eruv is accepted.
A neighborhood seen by the wider community
Public carrying in Crown Heights would naturally be understood as the accepted practice of the neighborhood and its Beis Din. Visitors may not know the details of the proposed boundary or the local rulings; they see what residents do.
That is particularly relevant during Tishrei, major farbrengens, family simchos, and the many ordinary weeks when guests stay in the neighborhood. A person familiar with carrying at home can easily assume that the same practice applies here unless the local position is clear.
The Crown Heights Rabbonim have instructed that carrying remains prohibited. The public practice of the neighborhood should reflect that psak rather than create the appearance of an accepted eruv.
Rav Moshe's concern about visitors
Rav Moshe Feinstein discusses the effect of public carrying on visitors. In his treatment of Yerushalayim, he explains that even where a local basis for an eruv might be considered, visitors can see people carrying and then carry after returning to places where no eruv may be relied upon (Igros Moshe, Orach Chaim I:139).
Crown Heights presents the concern in a direct and recurring form. Its visitors return to cities and smaller communities with different street layouts, local Rabbonim, and halachic standards. What is seen in Crown Heights can become an assumed Lubavitch practice elsewhere.
The point is not that every local eruv is the same. It is precisely that each place has its own facts and psak, while public carrying is learned by observation more quickly than those distinctions are learned.