I'm thinking ignorance and troll.
First, CO2 is humane. It puts the animal to sleep and then they die. They do not suffer agony and they only suffocate(as you put it) after they are asleep. Have you ever watched the process? I have. They walk around and then lay down or all over and there's no struggling and no indication of distress.
But then, you know so much better from all your inner knowledge. From where again?
And again the Big Producers show their facilities and they DO take great care of the breeders and of the feeders for the SAME reason I stated. They live in clean housing, are watered and fed properly so they produce and grow well.
It annoys me to no end to see ignorant people spouting off lies they pick up from HSUS/PETA type groups. Especially when they are presented with facts from people who have first hand experience who refute it with facts and they STILL cling to the junk and lies.
The people are finding homes for the pets. An "accidental" litter is by very label an "accident" and can happen a million ways. It's not a good thing but a lot of people come by their beloved pets that way. If you think that shelter overpopulation is because of over-breeding, you're sadly mistaken and if you look for the truth you'll find it.
And if you don't think it's feeding live, how EXACTLY do you think they're being put down? You can't use CO2 gas on something larger than a rodent. But it's okay, and it happens "all the time" or "more often that we thinK" because YOU say so.
Right. Go troll with your misinformation on Craigslist. You're probably one of those that run about flagging everything and posting that everyone just wants the pets to feed their monsters and inflames the public about responsible herp keepers in the first place.