People also don't understand how hard it is to officiate an NBA game.. Refs don't get an overhead view like someone sitting at home looking at their TV.
I've sat courtside at Hornets games three times, the game isn't nearly as fast as people think it is. Don't get me wrong, it's fast, but not fast enough to where someone shouldn't be able to call a good game.
I've sat court side as well, questioned a call and realized how wrong I was when I looked up and saw the replay.
Also, people don't realize how hard it is to officiate a monster of a human like LeBron. He absorbs so much contact, you can't really tell how hard he's being hit, or if at all.