I think you are right about a parents taking some responsiblity for their babies. And on this particular ride,as well as some others, you can't simply put a height requirement. There are body weights, age and other factors to consider here. Unfortunately, the agency that deals with such things (I don't know which it is) hasn't thought about this. Maybe now they will. With so much money to be made, it's a wonder there are any rules at all. So very, very sad for these parents and all the others who have had to deal with something like this coming out of a day that was supposed to create magical memories.