Hatred derives from the fear of the individual against the unknown (territory, customs, rituals, etc.). It is therefore inherent as well as empathy with the nature of man, animal species like others such as great apes and felines. In order for the individual to overcome this hatred, he must become aware of it through education in all its forms (parental, school, university, cult, cultural, historical, memorial visit) but also through regular intercommunal exchanges. This natural hatred in Kant is not at Rousseau. In reality, the two philosophers were right because man can easily pass from love to hatred and vice versa. It all depends on his environment and as Spinoza had so well described of his desire: I‘m hungry, I’m thirsty, I'm afraid. One example among others is the genocide in Rwanda between the Hutus and the Tutsi where the massacres decimated fraternities, neighborhoods and friendships. The fight against hatred is never completed and calls for a common policy and continuous vigilance to be instituted at all levels of human society with cells composed of specialised experts (historians, biologists, sociologists) issuing their conclusions to the policies and being published regularly.