These anti Hybridization threads are almost as anoying as a creationalism verses evolution arguement.
Someone mentioned about bloods being endagnered, and we should only breed bloods. Even if there are millions of pure bloods in captivity, they may still become extinct in the wild, and captive bred snakes are not allowed to be put back into their native environment. That is the sad truth.
Hybridization does occur in nature. It can only occur with two species of the same genus (So no, nobody will be getting a kick in the teeth if they breed a boa to a python, because nothing will happen) with the same number of chromosomes. That means that the two species are very closely related anyway, ans may very well have evolved from the same ancestrial species.
It is not bad at all if you create hybrids. As someone said, they are in captivity, not nature. Even if they were out in the wild, they wouldnt be able to reproduce, so it wouldnt take over the niche that its relatives are currently located in.
People should just calm down. This is a matter of personal opinion. People shouldnt try to justify it as being wrong in gods eyes or some other nonesense along those lines.