For every one who are so quick to say they would never take an inbred dog, how do you know the dog at the shelter with a completely unknown pedigree is not inbred? At least with these dogs you know the pedigree and it is a pretty good one at that. Who knows how these pups will turn out? My guess is that they will have extreme intensity being bred so close on Django. They may make very interesting sport dogs if place in the right homes.
For me it is more the paying money for seriously irresponsible breeding. Some people do a test litter, 1-2, and that would really depend on the experience of the breeder on whether or not I would want to participate in that. But the instant someone said it was done by accident, no money is going to change hands. People who own intact dogs have an obligation to be careful with them. Accidents may happen, but they should not profit off of those accidents, no way, no how.
Rescues and shelters are cleaning up the messes that irresponsible people make when they get a dog without thinking, when they dump a dog, when they dump a litter of puppies. No, you cannot guaranty that your unknown rescue dog is not inbred, but you aren't encouraging more irresponsibility by rewarding it.
If someone doesn't protect their bitch so that an unwanted pregnancy does not happen, then all of the expenses of whelping, vetting, raising the puppies, and placing them in homes is a good penalty for not being careful enough. Next time they have an intact animal, they will be more careful, or they will take steps to ensure they do not have an intact animal, because it costed a lot of money and took a lot of time. If they make $500/pup times 8 pups, that is $4k, after extra food and vetting, probably well over 3K in the bank. That is not a deterrant. I wouldn't participate in encouraging any type of oops litter, even if sire and dam were not related.
Too many people think that saying oops give them a free pass. No one need judge them for breeding because it is and accident and dogs will be dogs, no one is perfect. Some of those people very much wanted to have puppies, and were perfectly happy to have them now, even though the bitch is not old enough or other hoops have not been jumped. If someone simply does not want to take the beating that the breeder-haters will give to anyone who deliberately breeds dogs, and says oops, than I don't want to deal with them either. There is nothing wrong with breeding if it is done with thought and responsibility for the animals used and the animals produced. Hiding behind an oops kind of gives me a bad taste in my mouth.