The Fable of the Bees once said: a person who values honor must possess courage. Without courage, all his other principles were, at most, a sword without a point.
Besides courage, those who valued honor also needed principles. To defend those principles, they did not hesitate to give up their jobs and wealth, even their lives.
Compared with Death Eaters, Grindelwald's followers were more "rational." Perhaps that was because they had once passed through the "ring of fire" Grindelwald had set in the Lestrange family catacombs in Paris. Only those whose faith was unwavering could pass through those deadly flames.
Those who sought to transform a country, or even the entire world, could not succeed merely by cultivating and exploiting discontent. Stirring up personal suffering and subjective ill will did not foster friendly negotiation; it made a "peaceful resolution" impossible, and also subjected one side's will to the arbitrary unilateral control of the other, excluding it from objectively participating in cooperation with society.
Yet there were always clear-headed people. Some might join in to seek profit, while others kept their distance. Apart from Bella and Regulus, who had been deeply influenced by her, the Black family had no other Death Eaters. After hosting Voldemort once, Mr. and Mrs. Black ceased attending social functions and began living in seclusion. They had not even invited anyone to Sirius's father's funeral.
Negative emotions always cooled after being vented. The more one had to lose, the less one dared to throw oneself into change alongside those who had nothing, because failure would mean losing everything accumulated over many years.
They disliked change and rejected new things to preserve the status quo. Compared to Muggles, Muggle-borns posed a greater threat to them. Some outstanding Muggle-borns would take jobs that had supposedly "belonged" to their nephews