Hmmm… loyalty isn’t slavery or blindness or refusing to admit a mistake.
Loyalty works like this. If someone accuses your friend of a crime, and your friend says he didn’t do it, you have a choice. You can believe a possibly true accusation, and end up betraying a friend if the accusation turns out to be false, or you can choose to believe in your friend, and be betrayed by him if the accusation turns out to have been true.
A loyal person will take the possible bad outcome (be betrayed by a friend) on himself. A disloyal person will put the possible bad outcome on their (so-called) friend’s head.
I’m not sure humans can really be “loyal” to an idea or ideal - it seems to me something that is extended to another person or group, and not really to abstract ideologies. But even if you can, people who cling to disproven ideologies still aren’t “loyal” - I’d call them “brainwashed” or “fanatical”, personally.
