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In his essay Conscience and Truth, the future Pope Benedict XVI tells of meeting, at the beginning of his academic career, an older faculty member who expressed gratitude that God would allow for so many unbelievers in good conscience. This old fellow was an otherwise devout and serious Christian who nevertheless felt that it was a mercy on God's part to allow for this; in Cardinal Ratzinger's summary, this older colleague's opinion was that "if their eyes were opened and they became believers, they would not be capable, in this world of ours, of bearing the burden of faith with all its moral obligations. But as it is, they can go another way in good conscience, they can still reach salvation."
This is precisely the opposite of the point of doctrines such as invincible ignorance, and while well-meaning on the surface, it is a very pessimistic attitude towards the faith. It borders on being and attitude of hopelessness in the face of faith, which is the opposite of what faith should produce.
