The story is more critical than just that. Paul, the hero figure of Dune, is treated as the Messiah, and the people put total faith in him. This leads to a holy war across the universe, because people trust charismatic leaders too much. It’s a lesson that, no matter how much you like a leader, they always need to be questioned.

Luckily, for the Dune universe, this all happens because Paul actually is good (maybe, if what we hear about it is true, though I believe we’re supposed to question this too). He sees that the people are too trusting of charismatic leaders, so he must use this and cause massive damage, in order to teach humans to question their leaders and to think for themselves. Paul actually can’t give up his last bit of humanity to do this though, as he actually is too good of a person, and his son has to do it instead.