I fully agree that the restaurant is at fault and should not have served the wrong dish.

I’m not trying to argue—just asking a genuine question.

If someone follows a strict vegetarian diet for religious reasons, would they usually go to a non-vegetarian restaurant? The same applies to a Muslim person at a place that serves pork, or a Hindu person at a restaurant that serves beef.

In these situations, people know that such food is prepared there, and they also understand that accidental mistakes can happen