I think this is the key to what happened.
I think it is the Cornerstone to the foundation, not the key that opens the lock.
Until they can excise and prevent reentry of the same degree and magnitude of incompetence, mismanagement and doubling down of clearly incorrect thinking this will happen again. Until this can be corrected the leadership will continue to fall over, over and over again. In this case children were caught and killed in the crossfire of this mismanagement. Who will it happen to next? What strategies and training will they use to better guide, strategize, reformulate, rebuild into a better faster stronger and more efficient police force to deal with the evil that lives in the heart of man?
In a perfect world the police would have developed a clearly defined plan and utilized clear tactical strategies, assembled in superior numbers and training and equiptment, to go in and HUNT this terrible DEMON and KILL it!!
Clearly legislating evil out of the heart of man does not work. Clearly mandating courage in a frightening situation does not work. It takes a certain type of anger to run forcefully into a terrible situation, especially when you know you can get trapped and be killed.
This is a really difficult question, and I think I would be asking too much for any of the leadership involved to maintain any sort of self-awareness, and honesty in the same breath.
I would expect they will scatter like cockroaches when you turn the light on.
The shame they feel for this and any failure like this must be unbearable. But maybe I am projecting my emotions on to them. No I did not read a 500 page document, I'm not going to, I have enough books to read.
Some truths are self-evident, and this is one of them.