Put a different way, I'll bet there is no "line in the sand" we can draw between any two of us as to the appropriate interaction between us and someone/something under our temporary control - be it a child, dog or wild animal.
Stated another way, I've seen people who claim to love dogs - who raise them and interview prospective adoptees more stringently that I do my babysitters, treat the dogs in borderline ways. When questioned, I get oblique answers. My guess is that we would all have the same experience were we in a room together. While I freely admit that I would not be labeled as a vegan, my guess is my treatment of the animals would only differ - and not be more extreme - than many others.
We're arguing something that has nothing to do with people realizing their impact on animals - but that all animals have the same evolutionary rights as any other animal. Those that see all things on the same scale - well, I can't argue with them - I think their entire premise is flawed. Those that realize that there is a realm, a continuum, if you will, of life on the planet, will recognize that you cannot judge your concept of treatment from different rungs on the ladder.
Therefore, while I respect your right to an opinion, I do not find that it has merit or substance in how I choose to approach my interaction while diving, and the instruction of others.