They kill so many humans in FFX, not just Ronso. In fact I didnt see many Ronso killed at all.

Al Bhed are humans, just another race.

Shoopufs are animals, and ridden just the same as horses or elephants. They dont treat them badly, they just use them as work, and I dont think walking is very hard. Its not like there's any proof that they work them to the point of exhaustion or any such thing.

Red XIII was not treated badly at all in AC. He was a very minor character, and he did Cait Sith a favor by carrying him around.