I learned how to be responsible with a mutt pet store mouse (my sister and I bred them and raised the babies and kept them all). I also learned to be responsible with our mutt dog(s) and cats. I have never bought anything from a breeder, the only pet I bought from a store is betta fish (and other fish). I would teach my kid responsibility by going to volunteer at a shelter and various rescues and helping the cast-offs before buying from a breeder. And don't get me started on the human population!
(anyway, I have my opinions and you have yours. I'm going to stop posting stuff like this bc its someones baby bunny thread and not a topic for arguing)