From my point of veiw (of what Catherine would think) of the 'rescueing turtles' what was done was continuing the fact that the seller did make his profit and nnow will continue to get turtles to sell...........
If he had no one buy turtles, he would thus have gone on to selling some other peoo helpless creature; humans in some parts of the world are so selfish and poor, and in many ways over populated to the point that they will exploit any animals in order to survive......sad.
Taking Catherine's philosophy, what would she do? Buy the turtles to save them from the pot or to leave them to their fate? Her beliefs work only if everyone holds the same ones. That's never going to happen. If it did, we would all be sitting in caves frightened to leave in case we trod on a bug.
There is a lack of moderation and practicality in her views and I still don't know how she reconciles them with keeping animals herself. I'm not a god botherer but the first part of the Serenity Prayer springs to mind:
God, give us grace to accept with serenity
the things that cannot be changed,
Courage to change the things
which should be changed,
and the Wisdom to distinguish
the one from the other.