Overproduction does not lead to a miserable life. Ignorance and neglect do. AND I say this as someone who does turtle rescue and get in MANY abused, neglected or just too big to handle anymore but otherwise healthy sulcata each year.
I don't think anyone is morally obliged to destroy any animal's eggs. I think the obligation is to be sure (to the degree possible) that the people who end up adopting or buying these animals have knowledge of what they are getting into and how to properly care for them. Also -- If you have a bad feeling --trust your gut and NOT sell or adopt the animal to that particular person.
Things happen in people's live as well. Sometimes there are good care takers who (due to circumstances beyond their control) no longer can provide the necessary care for their torts.
More times than the above scenerio, unfortunately, I have seen folks who made an impulse buy and have an animal they cannot or do not want to care for. They come in crappy shape (last one had the appearance of pyramided pancake tortoise and shell so rubbery you could probably fold him in half). I never lecture them or anything (it would be pointless). I just take them in and find them a good home. (I love sulcata and wish it could be MY home but, unfortunately, with all the aquatics I have and my 2 redfoots and 1 yellowfoot tort I don't want to be someone who cannot invest the time space necessary to keep a sulcata properly for the rest of my or its life).
Anyway point is it is only wrong to tell a potential customer mis or half truths about caring for them and take the money and run-- not wrong to bring them into the world.
IMHO
THE END AND OFF THE SOAP BOX I GO!!