The Illuminati’s purpose is to secure the ongoing survival of the human species.
Like all organisms, the human species naturally strives against extinction. Though your countries have borders and your languages have barriers, all people in all places are members of the same biological family. All humans are pieces of a collective that keeps humanity in existence.But by nature, the human is affected by instinct, emotion, and imbalance.
A human will turn on one of its own species for reasons that will never matter in a thousand years, and likely not matter in even a hundred or ten. While you have seen the Light in the distance and chosen to follow it — even if from mere curiosity — there are millions more whose backs are turned against its glow.