Notwithstanding BCCI interference, this was not a clear cut case, both legally and otherwise IMO.
Defending a racist remark would be to place yourself on the wrong side of the fence, however, Aus had too much going against them.
No direct evidence, Symonds being the provocateur, heat of the moment, possible mishear/misinterpretation of the term, batsmen don’t have as much motive to sledge esp on a decent partnership, Aus having the history of sledging, further weakening a touring side by banning a player against a powerhouse team... etc
Think of this as reducing a 1st degree murder conviction to something much less based on all of the above circumstances.
Having said that, I cant help but think that Harby should consider himself lucky he got off with a tap on the wrist