I'd agree with your last point if it weren't for the fact that police are trained to be militant in the first place. 'Better training' could very well have meant 'being sure to not get caught'. The idea that police training would have been a good solution here is a bad premise from the outset. The fact that David Grossman still gives talks and is popular speaks volumes to the issue. The police are a brutal military force and, the vast majority of their jobs need to be replaced with social workers who understand mental health and harm reduction issues.