Obviously, I could be wrong - but so could you guys. I'm making my statement as an opinion and y'all seem to think that you have stated some provable facts.
Apparently, the "brass in the pocket" thing has been discussed before. That doesn't mean the conclusion that was arrived at was correct. It's impossible to know that an officer putting brass in his pocket was due to training and it's impossible to know that it got him killed. Dumping the brass on the pavement might get him killed? Way to many variables at an event that none of us witnessed.
It's an interesting theory, don't state it as fact.