I've seen this video before, and the time it took for the parents to produce it with their own mock outrage is telling.
Could the situation have been handled better by the CM? Certainly. Could the parents have kept better control their child, whom they KNOW has trouble understanding social norms and proper behaviors (of no fault of his own)? Absolutely. It was a sad incident, and frankly I don't think anyone is at direct fault.
That being said, if my kid (who is perfectly normal, as far as I know) would also have tried to do the same thing, and I would have yanked her back so fast the moment she crossed the parade line her eyes would have jumped out of her sockets.
I've done costume work in hot and crowded environments, and I can tell you...you will be attacked.
Kids will hit you, smack you in the private spots, punch you, bite you, kick you, rip off your head or costume, etc...list goes on. Many times with parents urging them on or laughing along.
I even did some professional sports mascot work where ADULTS (with some liquid encouragement) tried the same (hello Greenville and Jacksonville hockey fans, if you are tuning in, I'm thinking of YOU!)
Now, I'm not implying that "little Joe" was attempting to attack Maul...but, the video makes a very convenient use of a "still frame" to imply he was looking for a "high five", and was unjustly physically rejected, which the previous scenes in the same video, when taken in real time, looks a lot more like he was trying to swat Maul, rather than asking for a high five...you know...where you hold your hand up in anticipation of a response?
I also find it telling that "little Joe" looked back at his parents right before he ventured out, who were gleefully filming the entire incident, before proceeding (which implies he was looking for parental approval, which, he either got an affirmative from them through positive action or inaction as they were so consumed with filming)...
In any case, the kid wasn't harmed, outside of being a bit shook up and probably and understandably upset...
But, his parents trying to turn this into a claim of massive emotional and long term meaningful harm? That I don't buy, condition aside.
The whole case just reeks of sad opportunism to me.