IMHO, you can’t say dan kelaf zechus for both people, and since unless proven otherwise murder is an immoral and horrific act, shouldn’t we be dan lekaf zechus for the murder victim and not the murderer?
That does not make sense.
Murder is an unlawful killing with malice aforethought. Thus, we don’t know if it was a murder until we know whether it was unlawful. So there is no murderer or murder victim. There is a killer and a killed. So there is no reason to assume either way based on your idea of dan l’kaf zchus.
I also don’t know where you got this idea that when being dan two people l’kaf zchus, we should start with one side being the “muchzak”–you made that up.
Also, I have never heard of being dan a goy l’kaf zchus.
Also, being dan l’kaf zchus is only when it does not make sense to do so–that is when you need a mitzva to do it. When it makes sense to do so, you just do it because it makes sense. In this case, there is so much we don’t know, that forming an opinion either way is absolutely idiotic. What makes sense is to not be dan at all. The prosecutor needs to be dan, and on the basis of what she knows, and she knows more than we do. But we know less than her, and have no obligation to be dan, so it would make no sense to.
I agree with you though, that some people have taken it too far and have started assuming that zimmerman is not guilty, thus making the same mistake as the liberals and blacks who assume he is guilty. Rather, the proper response is to recognize that we don’t know enough yet, and to condemn the white house and the black leadership for turning this into a race issue and inciting racial crimes all over the country.