That is a ridiculous statement. Animal cruelty? You can't be serious! As far as inbreeding goes, you are kidding yourselves if you think most of the dragons in the U.S. are not related in some way. When was the last time wild caught dragons were imported here from Australia? And speaking of wild dragons, do you not realize that bearded dragons (and other wild animals) inbreed in the wild all the time? These animals do not avoid breeding with others that are closely related to them.
NOW, with all that being said, I am a strong believer in outcrossing reptilian bloodlines. It is always a good idea to bring in animals that are not closely related to whatever bloodline you are working with to outcross your lines. It is commonplace for herpetoculturists to inbreed for 2-3 generations in order to reproduce a specific recessive or dominant trait, sometimes even a line bred trait. Responsible breeders will then outcross the morph animals to strenthen the line.
With the limited gene pools we have to begin with (I am speaking mainly of bearded dragons and leopard geckos), I sometimes wonder if in a lot of cases we are only making ourselves feel better by pretending that we are breeding "completely unrelated" animals together. You have to admit that most of these animals descend from very few bloodlines in the first place, and they have been inbred and mass produced for years. I think it is really wrong of some here to cast stones at certain breeders over and over and over again for what those people perceive as "wrong". My $.02.