I'll take a stab at that.......
I think Jeff's point is to illustrate that "inbreeding" occurs naturally and quite regularly, and that it may even play a part in the evolution of a species.
The argument against "inbreeding" often includes or imply's that it is not natural, and doesnt' occur. Well, what about social animals that are born and raised in social groups?
I could keep writing until I'm blue in the fingers, but I don't see the point. There is plenty enough argument in the fact that for over 25 years, Leopard Geckos have been inbred. How about all of the wonderful Australian fauna that is on the market today, it's not like breeders can import wild caught animals to deversify their lines........Regarding the two examples I've given, can anyone say that there has been anything bad come of all this?
I guess the bottom line is reptiles are not mammals. Yes, inbreeding has been proven to be harmful with mammals and I think that is just carried across the board and applied to reptiles as well.......
Just my $0.02