That’s what the courts say. They say they were acting in good faith regardless of killing the family dog, child, wife, sleeping husband at 2am. Remember the case where the cops tossed a flash bang into a baby’s room? Burned her pretty bad. Cops were in wrong house, court absolved them since they were acting in good faith they were in the right place.
I heard about that flashbang incident in Indiana, and that pissed off a lot of people and the no knock warrant stuff as well.