Well, aside from the cultural elitism here (don't "teach" them about this), I think what you are arguing will happen is almost unavoidable in a globalized world. Withholding out of concern for the environment is simply entrenching the existing social order. It's a very "white mans burden" thing to argue.

Additionally, the best response is not to withhold meat, which they will no doubt come to anyway, but to offer a sustainable and realistic alternative. You can't stop the flow of global food, but you can make it cheaper and more sustainable. And cheaper will generally win.

Finally, you simply made a huge jump from "let's get them a chicken to live on" to "it's a terrible investment because commercial meat production is bad". This is not an obvious jump or foregone conclusion.