Did JFK die in Vain?

On April '61 John warned you, about a conspiracy that none knew. '63 is when he died, and from the footage, somebody lied. They said the bullet came from the behind, It was from the front, so keep in mind, the moment which he took the smack, his head from the force, went straight back. Laws of physics don't tend to lie. And from the video, this we can't deny.