One thing that was the primary influence of whether this was actually self defense or not was what happened between the interview where he explained how and why he was there, to the start of the video in front of the store where he first fires. I'm not sure (I haven't been following the trial) - but have seen a few people mention that someone else "shot into the sky" while a fire was being put out, and words were exchanged, which led to the accused leaving the area, going to a better lit area, which is when the infamous video started.

It really puts a different perspective on the entire thing, especially if you notice at the end of the video he was moving toward law enforcement the whole time.