Once again, we are not talking about split second decisions, such as whether or not to pull a trigger. Cops are already subjected to review boards when they pull a trigger, and the process is sometimes fair, sometimes not.
We are talking about deciding which house gets the door kicked in. If the wrong house gets selected, innocent people can be killed, as detailed in many posts above. This is the kind of decision that is made well in advance. I am certain that there are procedures to be followed, and the only way the wrong house gets picked is because procedures were ignored.
Ignoring established procedures is one of the key elements of criminal negligence among professionals. Convictions that result in prison are very rare, but there is always the possibility, and that tends to sharpen ones attention.