Gone are the days when people who had an impairment of some sort were prevented from doing things by those who 'knew better'. These days, we have the knowledge to make adjustments which means people can do whatever they wish, in spite of a disability.
I suppose next you'll be saying that a football club were wrong to put Dave, who is registered blind, in goal.
You say you are being 'devils advocate'. That term is very often used by those who want to display prejudice but don't accept their bigoted views.
Fwiw, I've dived with plenty of people who were not going to be in a position to rescue me, and will do so again.