In my opinion, people who are secretive are mostly being careful to keep from being found out. They are usually involved in something they know will
piss people off (somewhere). They hush hush everything so they don't have to justify their actions.
The more immoral or illegal their acts the more highly secretive and paranoid they become about being discovered. Eventually everything is classified
top secret, "just in case".
The more then the whistle blowers hopefully "come out" and expose them for who they really are.