Seems legit
Cats and dogs are different in many ways, but they are also alike in many ways. For example, they both like to catch mice and bring them into the house; it’s in their nature and they just can’t resist it. That’s why there’s no point in shaming them about it. I can see how a pet might feel bad about peeing on the couch, but they’d never feel bad about catching a mouse.

This person was probably horrified to see their cat proudly stroll in the house with a mouse in their mouth and they didn’t know how to react. You can train your pet to be obedient, but you can’t teach them something that’s against their nature; you can’t explain to them why catching mice and bringing them inside the house is bad behavior.