Thoughtfull question......

In some remote village of India, one masterji isteaching the Mahabharat katha to class 6 students. He is at the krishnajanma' part of it.
Masterji:"Kansa heard the akashwani that his sister's 8th child is going to killhim. He was furious. He ordered to put vasudev n devkibehind the bars. First son is born, and kansa kills him by poisoning...Second one is born n kansa throws him off the mountainpeak. Third one is born."
Now Ramu, who is smartest of the lot, putsup his hand. Masterji, I have a doubt (sounding nervous n confused)
Masterji: "Ramu bete, whole India does not have doubtin Mahabharata then how come u have one?"
Ramu : Masterji, if Kansa knew that Devaki's 8th child was going to kill him, WHY THE HELL DID HE PUT VASUDEV AND DEVAKI IN THE SAMECELL ?
Masterji fainted.......