I love the opening paragraph of the cypherpunk manifesto.
Privacy is necessary for an open society in the electronic age. Privacy is not secrecy. A private matter is something one doesn't want the whole world to know, but a secret matter is something one doesn't want anybody to know. Privacy is the power to selectively reveal oneself to the world.
You don't need perfect privacy but you probably don't want to make yourself a resource to be exploited.
Most people become compromised because they do something that they're ashamed of others knowing. Knowing that there's no privacy in the spiritual realm, might cause people to pause before doing something abhorrent.
I value my privacy but there's nothing you can find out about my past that will compromise my future actions.