No one has to understand why something is a certain way for a person in order to accept that they have the right to make that choice for themselves just as a nondisabled person does. Perhaps they will end up in pain, but they find the experience worth that risk (or inevitability).
I mentioned an inaccessible field trip to a very physical place that DD was going to earlier in this thread. Trip happened. I helped her access as much as I could, despite knowing that I'd pay for it later due to some recent health issues of my own. Sure enough, that evening I was curled up in a LOT of pain. Prescription pain med level pain. Still recovering from it multiple days later TBH.
Was it worth it? Yep. To see her laugh and enjoy the activities her friends were doing, to see her try her hand at things she knew would be very very difficult for her -
worth it. I knew it would be painful for me, but I knew it would be a great experience and memory for her - and that was worth the later pain for me. There's too much she has to miss out on in life as it is. If there's anything I can do to help her access more of it, I will be all in, every time. I can appreciate others may choose differently if they were in my shoes, and that's ok - but it should be everyone's
choice.