It's only hard to know if we don't ask direct questions and expect direct, honest answers. The chips will fall where they fall. If race was a motivation, then no decent person wants that. If it wasn't; and this was an unnecessary shooting, well nobody wants that either. In any event, everybody has a vested interest in getting to the bottom of things.
But the longer we wait, the less we know.
I agreed with all but the last statement. We'll know when we know. Rushing to judgment doesn't generally result in good results.