As I've stated in regards to the Martin case: It shouldn't matter what the "character" of the victim is. They are a victim, and once we start playing the "worthy of justice" angle, we're all fucked.
I'm not suggesting that Trayvon Martin or Matthew Owens are not "worthy of justice". What I'm trying to suggest is that
context is important. Martin probably had little to no prior contact with Zimmerman, and the allegations about his conduct prior to that night (his alleged sale and use of drugs) are largely irrelevant because they have no connection to the events which led to his death. There was no pre-existing conflict between the two.
The Owens case, on the other hand, seems to be the product of simmering tensions between neighborhood residents which finally came to a head. It's unfortunate when things turn out that way, but it's clear to me that one or more of the people involved in the Owens case were real hotheads (including Owens himself).
With regards to both cases, I think it is inflammatory to frame this as "racial conflict" when there are probably more fundamental interpersonal issues which led up to these events.