George Zimmerman suggested it in his call to 911.
He started the call discussing recent break ins, then began to describe the suspicious behavior of the known violent criminal Trayvon Martin.
I really don’t know what else to tell you other than you seem incapable of seeing plain truth when it’s right in front of your face.
There was no "casing" going on. Trayvon was walking home from the corner store with tea and Skittles-- and no one (except you) is arguing otherwise.