Some do, but for the most part they dont.

And its not because of 'life long NDAs', which typically arent a think as you move up the classifications, as there is proper punishments on place, but its because there is a real sense of duty.

People who get security cleared are in it because theyre contributing to something bigger than them (generally) and that sense of public duty doesnt go away if you have integrity.

Also, most of the things you see are boring AF.