If it were true it would've been a fatal accident, but not a conspiracy. Covering it up afterwards, out of embarrassment, would've been the conspiracy - and keep in mind that the US govt. has covered up some pretty crazy things in the past. But I hear you, it's definitely a wild theory.
But covering for some low-ranking secret service agent's accident seems like a lower priority than covering up something malicious like the Gulf of Tonkin affair, which has been revealed.
Do you understand what it would've done to the US' standing vis-a-vis the USSR in the world if it were revealed that someone who is tasked with protecting the most important part of the executive branch accidentally killed them in exactly the type of event where they should've been keeping them safe? What image would that have projected to the rest of the world about America's abilities? Espc. in light of the then just happened Cuban missile crisis, etc.
Not enough of a nutter to argue passionately about it, but it’s not that out there. There were secret service men right behind him in a car that suddenly lurched forward after the shots were made (so a physical force could have caused the accident not just an itchy trigger finger on a guard). His wound implies behind shot from behind but placing the snipers behind hasn’t made sense ever.
FWIW, I don’t believe this is what happened, but as I understand it the Secret Service agents had recently been issued a new carbine - an AR-15.
At any rate, George Hickey was the agent usually identified as the person who would have negligently discharged his rifle, and photos of the event clearly show him with an AR-15.
Allegedly, the Secret Service changed their procedures shortly thereafter to require their agents to carry with an empty chamber. I have no idea if that’s true.
> Secret Service agents had recently been issued a new carbine - an AR-15
Perhaps I'm being too pedantic, but the firearm Hickey was carrying wasn't a carbine. It was a Colt model 601 rifle, the first variant of the AR-15 that Colt produced after purchasing the AR-15 patents from Armalite.
BTW, this "Hickey did it" theory was popularized by Bonar Menninger in his 1992 book "Mortal Error." Hickey later sued the publisher for defamation, but the lawsuit was dismissed.