I wouldn't choose to have that many kids but I would certainly not call thier decision disgusting.
I know it's their decision and they can do what they want but in my opinion it seems like all they are thinking about is themselves and not the rest of the world.
Didn't the mom almost die on her 19th kid? What would happen if that happened to the 20th kid? Is dad going to just take care of all 20 kids on his own?