Why do many people devote themselves wholeheartedly to cats and ask for nothing in return, but not to people?

People are kind and ignorant from the beginning, and after the baptism of society and cruel reality, they have evolved into thousands of different personalities and psychology; Burning and looting are not evil acts that have existed since infancy. People's kindness is maliciously exploited by many people, making them afraid of kindness and enthusiasm, which stems from the cruelty of society and the sinister heart. But animals don't. They just want to live. You are good to them, and they are absolutely 100% good to you. You don't need to cheat them. In front of them, you can completely relax your vigilance.