Uh what? I'll explain it more clearly to you if you don't understand; Dodos went extinct because whenever they were in danger they would call out to their friends and they would actually come too, and thus get all of them killed instead of just the initial one or two. This is stupid literally, this is not a good surviving strategy obviously. It's called natural selection. And oh my god wtf? Dogs and cats are not stupid? One of the main reasons dogs and cats are still here because they aren't. I'm not going to go on about this because it's a whole other discussion.
And secondly, there would not be an "abundance of our species if we ever got a hold of that technology in the PUBLIC". How do you think clones are born? Do you think they are just instantly a copy of the person they were cloned from like in the Pokémon movie? They would have to be born and raised just like any other human being, so no, it wouldn't cause an abundance because it would just be any other baby that was born because it takes as much effort.
Exactly what Shiny Celebi said too.