I understand. To me the issue gets complicated when a phobia could present itself or be triggered unexpectedly.The personal responsibility is what I have doubts about. It was really hard to admit at 45 years old that I could no longer handle rides that spin like teacups...I can only imagine how much more difficult it is to admit to having a phobia and being worried about riding a gondola and the possible ridicule that might come with such an admission.
If someone knows about these ailments beforehand and feels pressured, that's when character comes to play, imo. I can't ride Space Mountain because of my neck, and I wouldn't do it no matter how ridiculed or pressured.