For centuries, they sent missionary after missionary to help the rising young intelligence see past the biological heritage of survival as battle, to pursue empathy, cooperation.
After enough missionaries were pierced with arrows, burnt, nailed to trees, poisoned at dinner, beaten with clubs, enslaved, drugged, mocked, impersonated for material gain, and made figureheads for war, they stopped sending more.
A twist of space-time delivered the young intelligence and its world to a lonely universe with no other intelligence to harm but itself.
Perhaps one day they will relent and send missionaries again.
But not yet. It is still too dangerous.