You mentioned "past practice". Past practice is reflected in the national figures and the middle aged Black male being involved in the highest amount of crime within this entire country. And since there are tens of thousands of police interactions with the public, every single day, and only the occasional Police shooting of a black person, in my opinion, the police have the right to use common sense and go on high alert, and there is no excuse whatsoever for a Black person to think that the police are going to shoot him today, since the statistics show that it is very, very, unlikely that they will even have a confrontation, let alone get shot.
I understand that you are just using "trigger happy" as a way to sensationalize the issue, but the statistics clearly DO NOT show that the police are trigger happy has a group. Is there a few that panic or make mistakes on occasion? Heck ya, and one mistake is too many in my opinion, but they are human beings, and they would like to go home to their families each night, just like we do.
If you choose to never read another post of mine, that's fine, but do me one favor and watch this video..........It's only 2:09 seconds, but it says it all.
http://www.theblaze.com/blog/2014/12/21/the-policeman-by-paul-harvey/