I thought I'd just collect some gems gathered from the case (and the thread).
1) If someone follows you and generally acts like a jerk you're fully justified in attacking them. Even getting their gun from them and shooting them (thanks Lefty).
2) It's OK to constantly use a mugshot when discussing Zimmerman the burly white paranoid watchdog, and drag his every past deed through the microscope of public opinion; but Martin the 17 year old black boy who was carrying candy must be depicted only through wholesome photos that depict him younger and innocent looking, and his past deeds are sacrosanct and must never be examined.
3) Police officer statements are not to be trusted, but kinda-sorta witnesses with changing stories KNOW.
4) Your lawyer appealing for sympathy is sleazy, but a country wide campaign with marches and politicians on-board is peachy.
5) If you're half white but President you're actually black. If you're half Hispanic and shoot a kid you're actually white.
6) Give people some grainy footage and they're Quincy.
7) If someone beats you badly enough to cut your head and make your nose bleed, it better be a gaping wound and a broken nose or else they don't count.
8) If someone is hitting you, be sure and run a self-diagnostic before considering a response to make sure you're truly in danger.
9) Teenage males who's family has broken up can not be aggressive and reckless.
10) If you outweigh your opponent, no-one will believe you could be cowed or overpowered.