It’s not “some trim”, it’s basically half the animal. I buy several whole cows a year and out of a carcass that yields 400 lbs of meat, I’ve never managed to get more than 60% with a very good butcher. Cabeza/lingua/tripa/offal/oxtails aren’t going to get few more than a few percent points extra. Once you’re deciding on which cuts you want, that trim is unavoidable.

It’s definitely better to freeze the left over bits and grind it yourself, but half the animal gets ground up regardless.

These cuts have gotten expensive as they're now quite popular. Lengua, beef cheeks, and oxtail are no longer cheap.

> Grinding otherwise edible parts of an animal killed on one's behalf because one disfavors (or is repulsed by) them seems to me much worse than the killing. Eat - and enjoy! - all of it or don't kill it.

Who are you to say that it's wrong for me to enjoy some parts of the animal ground up, versus in their original shape? Either way the entire animal is being eaten and enjoyed, so there's no reasonable moral basis on which to say it's wrong. Your position would make sense if people were throwing away the cheek, tongue, etc but we aren't.

The modern meat industry makes more productive use of the animal than what has ever been possible before in history. It makes the famed Native American efficiency of animal use look laughable.