Good intentions, regular worship, Bible study, do not prevent blindness. Part of our sinful nature instinctively chooses to see what we want to see and to ignore what we want to ignore.
Men use up their lives in heart-breaking political struggles, or get themselves killed in civil wars, or tortured in the secret prisons of the Gestapo, not in order to establish some central-heated, air-conditioned, strip-lighted Paradise, but because they want a world in which human beings love one another instead of swindling and murdering one another.