The Lone Ranger's kemosabe "Tonto" has a name derived from the Spanish slang for "fool" or "stupid" ... .
And from Western Apache kounʼnde (“wild rough people”).
The word in Spanish is pretty specific.
My father, who came of-age in the Eisenhower era, was a very good man. He was very intellectual. He was also a former Army special forces officer pre-Vietnam War, and he had a very particular reaction to any criticism of American culture that was pre-Rock'n'Roll, which he hated, or tied to the military, the government, or Americana. He was a very proud veteran and government worker who could be driven close to rage by criticisms such as those in this thread. He once admitted to me that he saw those John Wayne films and wanted to become a war hero. Whenever race or sexism came up his mouth went tight as a trap and I could see the steam building between his ears.
I never understood this reaction because he was very quick to denounce Southern racism or Jim Crow and considered the antebellum slave owners to be, in his own words, "the scum of the earth"...but he would get very angry if one tried to tie any of these historical facts to the United States of America.
It was a bit like the reaction of fervent religious people to criticism of their canonical beliefs.
My dad only started to question his double-think after his beloved little brother, who was a Vietnam vet, began displaying severe repressed PTSD in his 50s and 60s, and after my dad and I had had a number of superheated cultural debates, sometimes about Rock'n'Roll.
I imagine all cultures have people who feel the need to contradict anything, particularly overt evidence, that is damaging or embarrassing to the groupthink, but I don't understand it.