Imagine it's Christmas Eve. You're tucking your children into bed, and of course they're excited about Christmas. You tell them they better be good and go to sleep; then Santa will bring them gifts. But if they're bad, Santa will sneak in their room during the night and stab them, and other children will get to play with their toys.
Isn't that sick? How different is it from the teaching that God has been standing by watching centuries of human suffering, and doing nothing about it, and that at his "own appointed time" he is going to kill all the bad people and let the good people live in paradise.?