All of your arguments are opinion based - your opinion of their quality of life, your opinion that they should not be bred....etc.
Why can't you just agree that YOU will not work with spiders, and let others decide for themselves if the wobble is something they are willing to work with or not? It appears that your "proving a point" isn't so much about "proving a point" as it is trying to convince people that your opinion is the only opinion and therefore, no one should choose to work with spiders.
You even did so on another thread where the person was deciding between a spider and a pinstripe, arguing that the pinstripe didn't wobble, so it was the obvious choice.