Again, I have no problem with the egg being protected from being fed to his big brother, because it's simply a waste.
But I think in the case of Esther's quest it's good enough that you can peacefully settle it by just saying no and being done with the situation. Same as you can tell Mol that you won't steal the idol for her if you are not generally comfortable with the concept of stealing a holy idol, it will lock you out of the quest reward but that's that. Sometimes the good solution is just to say no and not to accept a very dubious offer with the plan to deceive your employer. And seriously ... giving Esther the owlbear egg does not sound like preserving the sanctity of life to me either, because you can be sure nothing good will happen to that egg. But I think this conversation is going nowhere, so I agree with the request to not make the egg accidental owlbear food but not with the reasoning.
