Please point out how many cases of deformities occur when breeding mother to son, daughter to father, or even brother to sister. 'Inbreeding' as you call it happens very often with NO deformities. This stuff happens on its own from time to time. Even from two snakes with no relations. Reptiles 'inbreeding' and mammals 'inbreeding' are two pretty different things. As with mammals there are very many cases of deformities. Reptiles do NOT have the same genes as mammals.
Many morphs have been produced from inbreeding. Recessives and co-doms for example.