Why do so many people blame "irresponsible breeders" for pets ending up at the pound...?

Why do so many people blame "irresponsible breeders" for the scores of dogs ending up at the pound, when it is actually the fault of the irresponsible owners who do not follow thru on their commitment to care for and properly train the dog they have obtained? A dog is a dog mostly, and you cant expect it to be anymore or anyless than that, unless you train it to be. From what I have read, around a 3rd of dogs in shelters are purebreds. A 3rd is a rather large slice of the pie, and if that many purebreds wind up in shelters, it has to be more than bad breeding. Even a poorly bred dog with health issues can make a good pet if you are willing to honor your commitment and love the animal. And animal shelters in my area are about as expensive as buying a purebred. There are hardly any "free" pups anymore. Seems rescues and breeders alike are all about money, or improving a breed standard than they are about creating a good pet, which is what most people are looking for in a dog. If that is the case, what is so terrible about breeders who do not compete in show competitions? Some breeders breed there pups for pets, not to compete in the akc. If the purchasers of those pups are willing to pay for an unregistered dog with the understanding that this dog is to be a pet only, and both parties are happy with this arrangement and the dogs well cared for, what is so wrong about it? Are akc pup buyers the only ones capable of loving there animals? Sounds like a whole lot of socialite hogwash to me. Discuss.