...let them know where protein comes from.
Eating meat is not WRONG, but it is to be savored, appreciated, and enjoyed. Something died to make that steak appear on your plate, so having the grace to educate yourself about the animal itself is a gesture worthy of effort.
I am not advocating dragging your 6-year-old to a slaughterhouse (though YOU might get some value out of that visit, yourself), but seeing a half a carcass at the butcher shop is going to be fascinating for them even if it freaks them out a bit. But the next time they bite into a roast and say, "mom, this is a good cow leg!", you'll know you've done your part.
**Find a butcher shop near you. Please. They are slowly disappearing despite the unique and valuable skillset only they can provide.
Here are some local Albuquerque butchers, to get you started:
El Mezquite Market (or any place you see with the word "Carniceria" in the name)