If you prefer mixed breeds, or always adopt from rescues, that is your right. If you prefer to purchase a puppy from a responsible breeder, you should also have the right to do that. Some people prefer to have a dog with a known background, sold by a breeder who will be there to help them through the inevitable problems that go with puppyhood.
Breeders who put years of work and thousands of dollars, not to mention all that WORK into their breeding program, should never have to apologize for producing beautiful, sound, healthy, friendly pups and placing them in wonderful homes. People who wish to purchase a well bred dog should NEVER be forced to apologize for not adopting a rescue. Some people want more than a mutt from a questionable background, and some homes have both. It's their choice to make.