This worries me.
I can see the fate of the likes of tetrateania... you know... that dull, coffee coloured snake that used to live in San Fran.
Look at the Scottish Wild Cat... irredeemably close to extinction now. Why? Habitat destruction? No. Persecution? No. Over collecting? No.
Inbreeding with a massive population of feral cats? Correct. Wild Cats are now just a bunch of moggies. The original Wild Cat will never come back, we've (almost) lost it through careless/accidental inbreeding.
If nature chooses to cross-breed species, that's fine. But we, as 'responsible' keepers must avoid it. If we make a mistake we must take action to remedy it. If we adopt this 'anything goes' attitude, just because babies are cute, a hundred years from now all Garters will be brown, with some checkered markings if you're lucky.
This has nothing at all to do with racism, or political correctness. It is our duty NOT TO INTERFERE with natures choices.