If you read the article you find out the headline actually understates the problem. Police were continually stopping parents from trying to rescue their children. This woman was able to bring several kids out of the school, but one of the dads was pepper sprayed and his 10yo daughter was murdered. I can't say for sure that they prevented him from saving his daughter, maybe she was already dead, but what I would do to police in that situation cannot be discussed because of Rule 2.