You could apply the same logic to shopping in ShopRite. How does an observer know that I’m going to buy something kosher? Perhaps I’m headed straight for the lobster counter?
The reality is that when someone sees me, he probably assumes that I’m there for some permissible activity. While it is possible that I’m loading up my cart with lobster while in there, the observer probably figures “hey, he’s frum, he’s probably buying kosher.”
Likewise I, as an observer, if I saw a frum person enter a nice treif restaurant, would first think “he’s there on business to meet a client and not to eat.”
If I can be dan l’kaf zechus by Shoprite, why can’t I do so by a restaurant?
The Wolf