Yes, definitely be careful of the responding officers. They can indeed be caught up in the stress of the event.
Via Guns.com; an officer endangers bystanders (he just happens to have used an AR):
http://www.guns.com/2013/10/04/town-...ne-fire-video/
"The town of Castle Rock, Colorado continues to support the actions of a police officer who opened fire on two burglary suspects as they sped past on an open road,
despite the fact that he missed his intended target and hit the vehicle of an innocent bystander."