Gotta disagree with ya on Tamir, Larry.  The audio of the encounter shows the cop fired within two seconds of arrival.  Even a 12 year-old's reflexes aren't good enough to follow an order to 'put the gun down!'  Hell, it took me one second just to say those four words (I timed it, speaking as fast as I could).  The kid had NO chance to comply. The cop murdered that kid and walked.

As for Trayvon/Zimmerman we're never gonna agree.  I will say that a black shooter who attempts to claim self-defense under "Stand Your Ground" is 400 times less likely to have that claim accepted than is a white shooter.

The United States of America has been an openly white-supremacist nation for far longer than it's been a 'closet' one.  And the social, political, economic, judicial and economic policies and practices predicated there-on didn't magically disappear in 1964.  And you know I know what I'm talking about based on decades of first-hand experience.