I was kind of suspicious of the idea that the more powerful pellet guns couldn't take a deer. Or something similar like a coyote, wolf, bobcat.
They're not far off from .22's, and it's all placement - eye, ear, neck, etc.
Same with a bad-guy target. It's just as well that you would only be wounding and escaping in that scenario, but the various possible outcomes are similar.
These 1200-1500 fps pellets aren't gonna just be bouncing off animals, generally.