Truth and Loyalty
We don't consider it "loyal" for an employee to stay at a company when it's paying her twice the salary she could make elsewhere; that's just calculated self-interest. Likewise, it's not "loyal" for a man to stay with his girlfriend if he has no other prospects. These attachments take on the color of loyalty only when someone remains committed despite a strong temptation to defect. Similarly, it doesn't demonstrate loyalty to believe the truth, which we have every incentive to believe anyway. It only demonstrates loyalty to believe something that we wouldn't have reason to believe unless we were loyal.