I actually don't know of any actual breeders who said they culled a spider due to severe wobble. I have known several breeders(including myself) who have culled defects that made the animal nonviable(kinking too severe to allow the animal to survive being most common and not a spider defect).
If the argument is "I don't think any spider should be bred because one MIGHT be hatched with a wobble so severe that they have to be culled"... then #1 you'd need to prove that spiders are being hatched with wobbles so severe they are culled and #2 you'd have to show it was at a higher occurrence than the possible defects requiring culling in all ball python hatchlings.
Normal to normal can produce defects. Incubator issues can produce defects. So to avoid the possibility of hatching a snake with a defect, don't breed.
If you just don't like spider wobble, then don't own spiders, as I said above. No one is forcing any keeper to own spider ball pythons. It's this nonsense that spiders are being murdered willynilly as soon as they hatch due to nonviable wobble issues that annoys me. Most everyone that breeds spiders knows they wobble. Some are unnoticable. I've seen spiders that "wobble" less than an excited normal.