I doubt there's any group as paranoid as political government-- any political government. And, it's why other groups get infiltrated so easily by the kings of paranoia in government-- other groups just aren't paranoid enough.
But maybe government is.
Government employees have to know their power and position are illegitimate. They'll deny it, but this is where the paranoia comes from. If they weren't so paranoid I might think they actually believed their own lies.
It's why they spy on us so thoroughly. On our emails, our online activity, our snail-mail, our phone calls, our credit card purchases, our guns, our health status, our location, etc. It's why they infiltrate other groups.
It's not to keep us safe; it's to keep their unearned power safe.
I'm not saying their paranoia is unjustified. If you're a criminal gang, you probably ought to be paranoid. Someone probably really is out to get you. The crown rests uneasy, and sometimes, the head that wears the crown rests uneasily on the neck, too. I just can't get too worked up when bad guys' paranoia turns out to have been justified. Death to tyrants.