The entire concept of a dead man's switch doesn't even make sense when you think about it.
Say you have some embarrassing docs about the CIA/military and you threaten to release them automatically if you're killed. Have you considered that there are plenty of people in the world who would want that to happen? People with lots of money and their own highly trained murderers?
Russia, China, Venezuela, Cuba, Iran, North Korea, possibly Mexico or Columbia (considering the shit the CIA's pulled there). Hell, I wouldn't be surprised if some US government agency, rich dude, or corporation murders you for some weird internal power struggle.
Who's going to protect you? The CIA/military? The very organization that couldn't prevent its documents from getting stolen? How can you be certain they haven't shifted damage-control planning?
The idea of a "dead man's switch" plays into the conspiratorial black-and-white view of the world where there's a single, unified cabal. Reality is more complex.
It did, it's a video of an NSA official murdering a congressman at a park then making it look like a drug overdose. I have to say, NSA operatives have really bad haircuts.
I know there were some news articles in the last couple of years of this being the case...