Earlier quoted context omitted.
They have to approach the situation prepared for the worst case scenario. Problem is that they typically lack the proper training and the discipline required, and act too hastily. There's also a huge problem with the whole that macho, gun loving, power-tripping culture, it just makes things worse, wrong profile of people gets that kind of job.
The worst case scenario? I’m pretty sure that is the scenario that played out. Police should be prepared to die wearing the badge, with civilian casualty being an absolute last resort. It works this way for the military. I can’t fathom why it doesn’t work this way with police.
As bad as it was, it probably wasn’t the worst case.