rehctub,
The first part was a playful dig at egg plant to demonstrate that opinion swapping the post before mine is largly pointless. Sorry if it was a bit obscure.
I was also commenting on stating your family situation it gave me the impression you were explaining something that didn't need explaining.I wondered why and thought to state the obvious
The 5 children and giving you mine was acknowledging you have more patience with that sort of thing than I. Again it was intended to demonstrate that personal differences make a big difference to how hard one works at a task either raising children or discussions.
I hope that helps sorry if I confused.
PS I i still dislike Egg plant maybe its the texture.

"Why is it that when an argument is shown to be unreasonable that the thread ends?"

I would have thought the weight of evidence points in the opposite direction. Most threads don't end when the argument is shown to be unreasonable. Posters devise all sorts of irrelevant stratagems to stretch it out.