You don't even accept the interview if there's no chance you'd work there. You don't know that there's no chance of working there until you know what your othe

You don't even accept the interview if there's no chance you'd work there. You don't know that there's no chance of working there until you know what your other options are. If you're still interviewing (i.e. you don't have offers/rejections in hand yet), you don't know what options you have. You might know that you won't accept Company X's offer if Company Y also makes you an offer, but that's quite a different situation from knowing there's no way you'd accept Company X's offer.