I think I've found the beef source.

Technically wild horses aren't native to the US, they were introduced by the Spanish. There's debate as to whether they're considered invasive or beneficial for the ecosystem. The federal government has historically considered them a symbol of the frontier.

Regardless, there's no sane reason to go killing them all.

what people don't understand is we could be grazing cattle there. argentinian cattle maybe. i hear they have the best steaks in the world.