I'm going to say some things that people are not going to like about this story.... the easily offended, skip this post.
First off, the rules to ride are NOT set by the parks, they are set by the ride manufacturers, who determine what type of forces the rider undergoes, and what needs to be done in order for someone to ride. The parks are there to enforce those rules, and if they do not enforce those rules, they take on the liability of an injured rider, not the manufacturer. No park wants to take that risk, so they do the smart thing and follow the manufacturers guidelines.
Secondly, the rules are not that she has to be able to "hold" onto the restraint, it is "grip." Why the difference? Holding onto something mean you can loosely wrap a hand, arm, whatever, around something, and you are holding it. Gripping something is when you can apply force to something, in this case, apply force to a restraint to help brace yourself for sudden changes of force; left, right, forward, backward, up, and down. So the fact is that to help brace yourself against these forces, someone must be able to grip the restraint, and she could not.
Thirdly, a big BRAVO to the ride ops who enforced the rules. Is it a touchy subject? Absolutely, but lets go over the situation here. Lets say that HP would have broken down, and she was required to evac. I do not know the evac procedures over there (and I'm 99.9% I'm wrong here,) but what if the procedure was to grip a rope/handrail/ect in order to cross over a very narrow platform safely, or she had to wear a harness, which she would have to put on herself? Because of her disability, she would not be able to do that. The ops acted properly in this situation and did not put her in a potentially dangerous situation.
I personally liked that whover wrote this article pointed out all the things she can do and I applaud her for taking her disability and turning it into a positive (admit it, how many would just sit around all day and mope if you were missing your hands?) but those things they listed, you don't need to grip anything. Equestrian, AKA horse riding, she can do while holding reigns, and I believe rock climbing was in there? Again, you can use your lower body to push yourself up, and use your arms for balance. None of that is gripping, so the person writing the article was trying to point out oranges when we were looking for apples.
Finally, every park has ride requirements, and every ride has the ride requirements posted out in front of the ride. In both cases that she brings up, she did not stop to read the requirements, ask an operator, or inquire before they bought the tickets if there would be any issues. The parks down here are more than happy to give out that information if you go and ask, because it elimates the issues that you get while on the actual ride, and elimates the dangers that she may face if she cannot grip the restraints. She is pushing blame on an industry that does everything in their power to educate the public, minus walking up to her while she is buying the tickets and saying, "Hey you can't ride this/this/this because of your disability" (which if you have ever had to deal with a situation like this, is completely the wrong way to do it.)
Those are my thoughts, coming from years and years of experience in the industry. While the parents did the correct thing and held their lawsuit, I dont see how the DoJ can do anything about this, except say "sorry 'bout your luck." Go ahead and blast me, I feel it coming on.