Columbus was brave, brave to the point of insanity.
Columbus had shopped his plan of a western route to India all over Europe before he tried Spain. King Ferdinand and Queen Isabel finally agreed to give him a small grant in a moment of exultation as they were a waging a successful war against the last Muslim kingdom in Spain.
Europeans of the end of the fifteenth century knew full well the Earth was more or less a sphere. They were wrong, very wrong about how big it was, however.
Columbus was not a sweetheart.
The Caribs and also the Aztecs whom his Spaniards conquered ate people*, the Spaniards did not (at least, not ordinarily).
* I am not judgmental myself. I blame a largely vegetarian diet. Watch out!