Loving your dogs and spoiling them doesn't necessarily make a responsible breeder. It's a sign of a good and loving owner, but it has nothing to do with screening for physiological and psychological traits and problems, type, temperament, propensity for allergies, etc.
Too often people think it's okay to breed little dogs as long as they're cute and relatively healthy, but the world is all ready full of cute little dogs that are relatively healthy - with other problems. The world is also full of cute, healthy dogs that are languishing in shelters or abandoned in worse places. That's not to single out breeders of small dogs; large breeds have their own issues that get a lot more attention.