Because the scammers want to select the most ignorant and prejudiced people they can find, they want dumb people who will never think twice, because they think

Because the scammers want to select the most ignorant and prejudiced people they can find, they want dumb people who will never think twice, because they think they are absurdly superior to what they think are dumb and utterly corrupt Africans, and thus, could never be scammed.