Which facts? In the Florida case we have two sets of "facts".

1. Zimmerman followed this kid
He called 911
He did not exhibit any defensive wounds
The kid did not exhibit any contusions on his hands consistent with beating on Zimmerman.
Zimmerman shot the kid.

Or

2. Zimmerman followed this kid
He called 911
Witnesses report that the kid attacked Zimmerman
Witnesses report that the kid was slamming Zimmerman's head into the ground.
Zimmerman shot the kid

Right now, the only facts that are consistent is that Zimmerman followed the kid, called 911, and shot the kid. And those facts mean virtually nothing without context.