I suspect they may have over emphasized the crusader mission, doing a bit of background digging it looks like that was a motivating factor for King Manuel, a number of his inner circle and importantly Afonso de Albuquerque however other leaders of Portuguese expeditions seem to have had more financial motives.
Quote:I don't understand why you'd come to a discussion forum, and then proceed to reap from visibility any voice that disagrees with you. If you're going to do that, why not just sit in front of a mirror and pat yourself on the back continuously?-Esquilax
Evolution - Adapt or be eaten.