None of this shows the SA justice system in a good light at all.
Whether he intended to kill Reeva is sort of irrelevant here- obviously it is relevant in the scheme of the trial and the punishment which should be given, however anything less than culpable homicide with a jail term sets a huge precedent for blindly firing a gun at whatever you see fit and then claiming fear as the motive.
Op may not have intended to kill Reeva, but I don't believe for a second he didn't intend to kill whoever was on the other side of that door. Just because he may have thought it was an intruder rather than his gf doesn't make shooting someone through a closed door (where they were not in a position to either attack or defend themselves and thus the motive could not have been self defense) any more acceptable.