Not defending or condemning the police's action (honestly don't know anything about it), but the number of gunshots is pretty much irrelevant. 14 rounds is two police officers firing most of the rounds in a magazine - this is what they're trained to do. Unlike movies, it's near-impossible to consistently disable somebody with a gunshot in a non-lethal way. This means that when cops shoot, they shoot to kill: centre of mass shots, often nearly emptying the magazine. It's not like it's a video game, where you can tell if you hit, so the safest thing to do is to keep shooting until you're 110% sure the target is dead. A police officer who only fires one round in an engagement like that wouldn't be acting in a safe manner, for himself or the people around him.