I wonder if we don't sometimes place too much emphasis on stress. I once watched a red rock crab grab ahold of a kelp crab, yank its arms off one by one, and eat them. I have to wonder how much stress this caused the kelp crab, who was being held helplessly as it was all happening. I pondered whether or not I should stop this cruel act ... and decided that no ... this is what life is really like down there. Everyone eventually becomes food for someone else. Sometimes they even kill it first. Compared to that, I wonder how much stress a diver really causes.
Sure, be responsible. They're not toys, they're living creatures. Don't cause harm merely for the sake of entertainment. But sometimes I think the "no touch" policy goes a bit to an extreme that it doesn't really need to. As in most things, the application of common sense is probably a better approach than a platitude. For sure, if you feel strongly about it, don't do it ... but I'd prefer to reserve my judgments to the situation, rather than some blanket policy ...
... Bob (Grateful Diver)