We don't give our government enough credit for a sense of humor.
The common trait, the fundamental skill of spies is the ability and willingness to lie. Aside from the training, the technology, even the politics associated with the alphabet organizations that have become the guardians of the nation's secrets, the rock bottom basic core of these people is deceit, misinformation, misdirection; tactical, official mendacity.
“Trust us.”
Yeah, sure.
While you're at it, got a bridge you wanna sell me?
You're already paying for the bridge, it's called Troubled Asset Relief Program, or TARP.
I bet you thought that if you had to pay for the bridge it would be your bridge, right? That's not how it works, you just get the bill, they got the title.