Quite true. However, we are supposed to try to overcome this as civilized people, not wallow in it.
Humans remain violent, and always will. Civilization does not erase that tendency, it often facilitates it with purpose and authority.
The only thing that tames humanity is love. It brings out the best in us. Love conquers fear and often overcomes seemingly impossible physical circumstances to be triumphant.
But love has an enemy, and it will cause each of us to make choices throughout life to demonstrate which side we are on. Whether we like it or not, the "right side" can involve as much violence as the "wrong" one. But that violence is for victory and then peace, while the violence of the other side is neverending. Unless someone fights back.