Also, with regards to some other conspiracy theories that many here support and The Abyss, I have to say that from my perspective, the conspiracy theory looks like the security blanket from the abyss.
Oswald shot and killed Kennedy all by his own crazy damn self. You have a guy that qualified with the middle range of rifle proficiency in the Marine Corps. I can assure you that anyone with that qualification could easily hit a slow moving head sized target at less than 100 yards with a scoped rifle. The President was unprotected back in those days (no armored roof on the limo). Oswald was a weird guy with obvious psychological issues and a dislike of America and the President - and a narcissism that demanded recognition even if it meant infamy . That's all it takes.
IMO, it is unsettling to some people that a lone whacko could light up the President. Far more comfortable to believe that it takes a conspiracy of high level people and a small army of henchman to do the job. Ruby shot Oswald for the same reason that after 911 some people took out their anger on Americans that looked to them like Muslims. People can be surprisingly patriotic. Ruby wanted to act like the mafia tough guys he admired and he found a perfect excuse to "make his bones". very simple scenario.
911 - far less of a stare into the abyss to imagine a supremely complex conspiracy necessary to destroy the towers and damage the pentagon and crash a fourth airplane that was targeting the capitol. It is too discomforting for some to accept that less than two dozen dedicated jihadis with box cutters could pull it off - because if they could, then anyone could do anything terrible, any time, any place.
And sorry, but "explain building 7" doesn't do it for me. Just because you don't understand the physics involved with that exact building design under those exact circumstances doesn't mean that it couldn't happen exactly as it appeared to (uncontrolled fires melting support couplings causing the floors to pancake somewhat (but not exactly!) straight down. IMO, it is the height of arrogance to proclaim that because you don't get it, it must be something else. And you can always find 1% of any kind of professionals (i.e. architects, structural engineers) to confirm any theory. Some people like notoriety. Some like to be contrarians just for the sake of it.
As someone said upthread, the real abyss is that no one is in control. Control is an illusion that holds firm enough most of the time because we all play along with it. As soon as someone decides that the illusion isn't for them, chaos breaks out.
Child sex rings and abuse and pedophilia are always lurking around being perpetrated by sickos that don't buy into the illusion that someone is in control. In fact, all psychopathic activity follows that pattern. The psychopath feels much glee and power knowing that control over an individual or society is an illusion. He feels superior by violating the illusion. He gets off on it. It is the violating that is the true reason he acts, material gains are secondary. There is no need for world power brokers to run these things. That is a myth. That is the security blanket, the protection from the abyss. The true abyss is that the sense of control is an illusion and anyone not buying into the illusion can destroy order and control in a New York minute and there is nothing anyone can do to stop it if the violator is even a little shrewd. And you won't recognize the violator until it's too late. It won't be the "elite" that the myth says it is. It's the one you never figure.