Because all humans have 2 things in them:
1. Love for violence
2. Racism
No matter how "tolerant" someone is, he still has those 2 things in him, even though he will deny it even to himself.
It has been scientifically proven that ALL people are racist. On a subconcious level, the person decides wether he likes the person or no based on how much his appearance is similar to his own appearance. It is true both about sexual attraction and simply about making friends of your own gender - the more a stranger looks similar to you, the more you like him(both as a friend and sexual partner).
The love for violence is also present in all individuals. Even little kids are interested in war games, and they simulate killing other humans from very young age by playing different games. The entire video game industry and movie industry is also based on violence against other humans.
Considering this, is it possible that we(different races of humanity) were born just to kill other races of humanity? Because we are all subconciously racist and violent.
And if its true the point of life is to genocide all other races except for your own race. Its like Battle Royale in real life and every race is a separate team.
