Humans are stupid creatures that wage wars on their own species, they are smart enough not to but they don't choose to. They are smart enough to know right or wrong but no. Their smartness is also the cause of this human nature because every human can have their own thoughts or opinion for something which causes conflict between them so my solution is "one body one mind" which is shown in so many media. But in reality it's also not perfect because individuality will be gone. Just FUCKING SUFFER ALREADY STRUGGLER