The definition of stupidity is incomplete, as long as not comprising pride. Ignorance is often wrongly interpreted as stupidity. But a person is as wise as admitting not to know what he doesn’t know. Stupidity includes the assumption of knowing what one doesn’t know.
Stupidity can be quantified in what Jesus said of a farmer who, after harvesting bountifully, entertained ideas of good-living (See Luke 12:16-21). The farmer’s idea of convenience was ensconced in self-centeredness, rather than altruism. But in that mindset, the farmer could not have been the only one of his kind.
He represented the majority of ordinary people, even today. While the white settlers demonstrated stupidity, during colonization, apparently, they were envied by the oppressed black people. The whites had assumed that failure to access education by Africans, described the stupidity of the black people.
Being ignorant of some information does not, necessarily, translate into stupidity. The definition of stupidity includes failure to disseminate what one knows, ahead of others. If others are ignorant, then those with knowledge bear the responsibility to inform the ignorant ones.
Out of stupidity, the white settlers failed to understand this principle, leading to guerrilla warfare. But what boggles the mind is how, after dislodging those white settlers, the freedom fighters came to practice the same stupidity? They, actually, became worse than the former white settlers.