Haruhi Suzumia is actually an abusing Demiurge, the false sinful god, who took a form of a young girl for his perverted pleasures of the flesh.
Kyon is someone like a Truman from a Truman's Show, a trapped aeon, who will never escape the Demiurge's realm unless he finds the Gnosys.
And others are just pathetic puppets, whose "powers" are just something given by the Demiurge and could be easily taken back. They maybe want to help Kyon but they can't, because Demiurge's bits of flesh tiying parts of the material realm, he can see and hear everything, and the slightest disobedience will reduce them back to ash, what they really are.
Or maybe Haruhi will prepare for them the fate worse than death.