Not the author, but I think there was some research and it's indeed better for you if you have head support, to be facing back towards the front. If prevents a whole range of injuries, from your neck, to becoming a projectile yourself.

But it's really theoretical, and does not account for the passenger in front of you headed head-first into your throat.

PS: I laughed hard that xlbuttplug2 is answering to deadbabe. The internet lives!