And companies like the profit it brings.

So as any other company?

As long as big money is involved, and the animals are the product, then they'll be treated as mere products

By the definition of a good product, you treat the "materials" within the certain standards - that is actually good

I don't see anything wrong with eating an animal if it dies naturally, having lived a reasonably happy, healthy life

Using your own logic: old animals don't have the voice to ask for euthanasia, so we need to do it for them

they owe their existence to us and so it's okay to continue with the systematic cruelty

Define how you measure the suffering. In many species, there is the alpha male, all the others are fighting, loosing and getting frustrated for not reproducing. That's the suffering.

Imagine the fear when the pack of wolves is chasing the pray, your own "baby" gets isolated, waiting to be eaten. Partially alive. Is that cruel?

Animals could be pets

Wait... Animals will live in a flat/ yard, incredibly small habitat. Without the members of the own species. Without the joy of hunting. Or the adrenaline rush while being the prey. That's the suffering.

And keep in mind one thing, the production of plants involves a lot of dead animals. It's inevitable.