I guess they aren't proud of the work they're doing. Because if they were, they wouldn't keep it secret.
When I was in my teens and I'd come home late at night after a night of doing things my sleeping parents wouldn't approve of, the next day they'd always ask me what I did the night before. And I'd plead the 5th. And they always would say to me, "If it's a secret, you must not be proud of it."
They were right.