Yes and no. With vaccine and modern wormers we can save the part of the population which would be susceptible to this. On the other hand not having vaccines would cause survival those susceptible to distemper would die out, the other live, reproduce and create a resistant strain. This is proven fact, so its not as if every breeder of old faced this problem.
At times to half the litter could be lost but other survive. Out of the remaining 5 pups only the best need be kept.
Anyway they couldn't afford NOT to kill them. If they won't protect the flock they are useless and if they harm stock and can't be trusted they are a huge liability.
Also I don't believe nomadic tribes today have access to vaccines. When breeds survive and thrube without such at times you end up with a breed that has a high resistance to infectious disease.
I'm not sure on men being killed, its possible but it serves to prove my point the mentality was different.
Even in sometimes working breeders have culled for cosmetic reasons.
Blue Pits were culled at birth by some
Dutch Shepherds ended up with dogs being culled over color. At the time standards were being introduced and dogs being shown BUT these were still working dog breeders that killed dogs who were the "wrong" color when people decided what should or shouldn't be allowed.
I've seen working dog breeders say they don't care what it looks like as long as it works and scream bloody murder over show breeders like RR who cull pups born with white legs or no ridge yet some working breeders are just as guilty of killing pups over a color believed to be inferior, an off colored pup because its "abnormal" or simply because everyone else did it.
In the breeder context, you are correct that the term "non-lethal culling" is used. But a good portion of this thread was talking about lethal culling, which is what I responded to. Lethal culling is not "to set aside" - it is in line with the standard dictionary definition of "culling."
This thread is about culling. Lethal and non lethal.
I made note of non lethal and definition because you said the word makes you cringe but yet it doesn't always mean an animal must die. That's what I was pointing out. Good breeders must practice selective breeding but it doesn't mean they have to kill.