It's hero worship. Dyson was an innovator and very much an outside the box thinker. He was also fond of what rationalists call "magical thinking".

"What the secular faith of Dysonism offers is, first, a hypertrophied version of the technological fix, and second, the fantasy that, should the fix fail, we have someplace else to go."

https://www.theatlantic.com/magazine/archive/2010/12/the-dan...