I agree.
Is it self defence if I am breaking into someone's else home, they grab a knife and "attack" me and I shoot them as I fear for my life?
Clearly no. The homeowner has the right to defend themselves from the instigator.
Is it self defence if I stalk someone walking down the road and they "attack" me and I shoot them as I fear for my life?
Or let's ask it backwards.
If I am walking down the street minding my own business and I am followed and stalked by another are they allowed to kill me when I defend myself?
EVEN if Zimmerman found himself defending himself he should still be investigated as evidence indicates that he is defending himself from an event he initiated.
Trayvon, per mobile conversation with his girlfriend:
""He says: 'Oh, he's right behind me. He's right behind me again,'" Crump said the girl told him. "She says: 'Run.' He says: 'I'm not going to run, I'm just going to walk fast.'
She then heard Martin saying "Why are you following me""
Florida stalking law arguably shows that Trayvon was being stalked. Easily as arguable as the "stand your ground" arguement. And that would mean that he was killed by someone in the commision of a crime.
"FLORIDA
Section 784.048. STALKING; DEFINITIONS; PENALTIES. 1997.
(1) As used in this section, the term:
(a) "Harass" means to engage in a course of conduct directed at a specific person that causes substantial emotional distress in such person and serves no legitimate purpose.
(b) "Course of conduct" means a pattern a conduct composed of series of acts over a period of time, however short, evidencing a continuity of purpose. Constitutionally protected activity is not included within the meaning of "course of conduct." Such constitutionally protected activity includes picketing or other organized protests.
(c) "Credible threat" means a threat made with the intent to cause the person who is the target of the threat to reasonably fear for his or her safety. The threat must be against the life of, or a threat to cause bodily injury to, a person."