Dune Messiah, Frank Herbert

In the second book of the Dune series, we see the divergence from what would have been the regular tale of a Hero who avenged the death of his father. Instead we are treated to the beginnings of questions that will haunt us through the Dune series. How will humanity distort the original message of messiahs? Is it possible to imagine and control every single impact of mass-movements? Will that kill what it means to be human?