I fully understand your position on this, I respect it but disagree that it isn’t ethical.
I find it way more ethical to fully control the process to ensure that a situation like the Desert gene doesn’t happen again. Since there’s a lot of assuming going on around here I’ll assume that’s what this means:
With regard to the ethics of culling (killing) animals we produce, there are two questions:
Will this act reduce or prevent suffering?
Will this act create or prolong suffering?
The answer to the second question should always be no - that’s it, that’s the guidance. As long as an animal is humanely euthanized, suffering isn’t created or prolonged.