I agree with you that those Craigslist comments are disgusting. Pets are not a product that you own and discard when you grow bored of it.
Getting a pet is like adopting a child. You wouldn't say "This child no longer fits my lifestyle, so I'm getting rid of it." so you shouldn't say it about a pet that you implicitly promised to take care of forever when you bought it.
You're very kind to adopt these Craigslist pets from people who clearly don't deserve them.
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