RIP little angels.
  1. They want to waste my money.
  2. They packed their bags and said "I'm out of here. Your life is too pathetic for me."
  3. They did not get watered enough?
  4. They got watered too much?
  5. They watched Donnie Darko and realized, they too were the living receivers and must save the world from a black hole, caused by a Tangent Universe.