One reason is the legality issue, you could get offspring
with the beautiful coloration of lewisi out of hybrid parents without having to deal with the paperwork involved with pure lewisi. This was pretty common back in the day with Indian Pythons as well....Crossing them to a Burmese meant you could sell your offspring over state lines without the ESA paperwork. And if you've ever seen any some...3/4 indians are just as beautiful as a pure molorus. Try finding some pure traceable molorus today...it's alot harder.
Another reason (and this is just conjecture on my part) but I don't think there were many pure lewisi out there to begin with when breeding cyclura was so hot in the late 80s/early 90s...so, if you had a male lewisi, finding a pure female was very difficult...and only got more so as time went on. So...to get some babies of SOME kind from your animal you bred him/her with what you had, oftentimes cubans.
I agree with you. It wasn't a good idea then and even less so now. BUT at least there are enough verifiable pure animals out there to allow for captive propogation and reintroduction. There's been poor judgement made in the past and with these two animals in particular some damage was done...but I don't think these examples are valid as arguments against hybrids (other than possibly in cases of other endangered sp. or animals with a very small captive genepools) Such as breeding Annulated Boas with Amazons or Savus with Macklots. Seeing your name, what do you think of the dickersonae hybrids that are out there?
Horridus