That’s not true. Most organisms spend a big portion of their energy on moving, eating, or just existing. Humans are one of the few organisms capable of creating a weapons.

There’s a huge difference between protecting yourself from harm and creating weapons powerful enough to destroy all life on the planet. We’re in the second group, no other species even comes close. And all that being said, the drive to procreate is even stronger than the drive to kill your neighbor, so good luck conditioning that out of society.