Looking at the worldview of Harry Potter as a whole.
The conflict between wizards and Muggles was not a simple struggle between good and evil, but a profound tragedy rooted in fear, misunderstanding, and the desire for power.
"No wonder it frightened and alienated so many wizards, allowing radicals like Gellert Grindelwald, who preached wizard supremacy and warned against the threat of Muggle technology, to gain so many followers." Ian knew perfectly well that what had truly frightened Grindelwald had also been the Muggles' nuclear bombs.
If one viewed things from the perspective of the wizarding community, especially the extremists represented by Gellert Grindelwald, one would find that the "rule of wizards" they preached was not insane rambling born from nowhere, but stemmed from a deeply buried fear of survival passed down through generations. This fear had quietly begun to grow from the moment technology first emerged.
What Grindelwald's prophetic abilities happened to reveal was precisely the sight wizards did not wish to see—the Muggles surpassing wizards through their imagination.
How could Muggles defeat wizards?
That disparity.
It existed in the hearts of nearly every wizard.
In the eyes of most wizards, wizards were the most formidable group, a more "superior" form of evolution. They viewed Muggles much as mutants viewed ordinary people.
Even those with goodwill still believed that Muggles were inferior to them, at least deep down. And because of that, once they realized that Muggles were also a chosen path of "evolution"...
Most wizards simply could not stand it.
It was precisely this fear of Muggles, along with their resentment and imbalance, that paved the way for Grindelwald's rise, allowing him to rally countless followers and unleash a storm that swept across the world.
Of course.
It was not merely about preserving their own sense of superiority.