Quote Originally Posted by Vesh
saibot, they are not killed by their defense against the poison. They survive. Their effective enzyme is useless (actually, it's lethal) in poisonous environment. Their ineffective enzyme nevertheless let them survive and possible develop more effective enzyme resistant to poison.
My point is that in developing a defense against the poison, the essential enzyme became very very useless. This will kill the organism.

Yes, the ineffective enzyme let's them survive the poison, but in the long run they wont survive.